Test Methodology
================
-VPP Forwarding Modes
---------------------
-
-VPP is tested in a number of L2 and IP packet lookup and forwarding
-modes. Within each mode baseline and scale tests are executed, the
-latter with varying number of lookup entries.
-
-L2 Ethernet Switching
-~~~~~~~~~~~~~~~~~~~~~
-
-VPP is tested in three L2 forwarding modes:
-
-- *l2patch*: L2 patch, the fastest point-to-point L2 path that loops
- packets between two interfaces without any Ethernet frame checks or
- lookups.
-- *l2xc*: L2 cross-connect, point-to-point L2 path with all Ethernet
- frame checks, but no MAC learning and no MAC lookup.
-- *l2bd*: L2 bridge-domain, multipoint-to-multipoint L2 path with all
- Ethernet frame checks, with MAC learning (unless static MACs are used)
- and MAC lookup.
-
-l2bd tests are executed in baseline and scale configurations:
-
-- *l2bdbase*: low number of L2 flows (253 per direction) is switched by
- VPP. They drive the content of MAC FIB size (506 total MAC entries).
- Both source and destination MAC addresses are incremented on a packet
- by packet basis.
-
-- *l2bdscale*: high number of L2 flows is switched by VPP. Tested MAC
- FIB sizes include: i) 10k (5k unique flows per direction), ii) 100k
- (2x 50k flows) and iii) 1M (2x 500k). Both source and destination MAC
- addresses are incremented on a packet by packet basis, ensuring new
- entries are learn refreshed and looked up at every packet, making it
- the worst case scenario.
-
-Ethernet wire encapsulations tested include: untagged, dot1q, dot1ad.
-
-IPv4 Routing
-~~~~~~~~~~~~
-
-IPv4 routing tests are executed in baseline and scale configurations:
-
-- *ip4base*: low number of IPv4 flows (253 per direction) is routed by
- VPP. They drive the content of IPv4 FIB size (506 total /32 prefixes).
- Destination IPv4 addresses are incremented on a packet by packet
- basis.
-
-- *ip4scale*: high number of IPv4 flows is routed by VPP. Tested IPv4
- FIB sizes of /32 prefixes include: i) 20k (10k unique flows per
- direction), ii) 200k (2x 100k flows) and iii) 2M (2x 1M). Destination
- IPv4 addresses are incremented on a packet by packet basis, ensuring
- new FIB entries are looked up at every packet, making it the worst
- case scenario.
-
-IPv6 Routing
-~~~~~~~~~~~~
-
-IPv6 routing tests are executed in baseline and scale configurations:
-
-- *ip6base*: low number of IPv6 flows (253 per direction) is routed by
- VPP. They drive the content of IPv6 FIB size (506 total /128 prefixes).
- Destination IPv6 addresses are incremented on a packet by packet
- basis.
-
-- *ip6scale*: high number of IPv6 flows is routed by VPP. Tested IPv6
- FIB sizes of /128 prefixes include: i) 20k (10k unique flows per
- direction), ii) 200k (2x 100k flows) and iii) 2M (2x 1M). Destination
- IPv6 addresses are incremented on a packet by packet basis, ensuring
- new FIB entries are looked up at every packet, making it the worst
- case scenario.
-
-SRv6 Routing
-~~~~~~~~~~~~
-
-SRv6 routing tests are executed in a number of baseline configurations,
-in each case SR policy and steering policy are configured for one
-direction and one (or two) SR behaviours (functions) in the other
-directions:
-
-- *srv6enc1sid*: One SID (no SRH present), one SR function - End.
-- *srv6enc2sids*: Two SIDs (SRH present), two SR functions - End and
- End.DX6.
-- *srv6enc2sids-nodecaps*: Two SIDs (SRH present) without decapsulation,
- one SR function - End.
-- *srv6proxy-dyn*: Dynamic SRv6 proxy, one SR function - End.AD.
-- *srv6proxy-masq*: Masquerading SRv6 proxy, one SR function - End.AM.
-- *srv6proxy-stat*: Static SRv6 proxy, one SR function - End.AS.
-
-In all listed cases low number of IPv6 flows (253 per direction) is
-routed by VPP.
-
-Tunnel Encapsulations
----------------------
-
-Tunnel encapsulations testing is grouped based on the type of outer
-header: IPv4 or IPv6.
-
-IPv4 Tunnels
-~~~~~~~~~~~~
-
-VPP is tested in the following IPv4 tunnel baseline configurations:
-
-- *ip4vxlan-l2bdbase*: VXLAN over IPv4 tunnels with L2 bridge-domain MAC
- switching.
-- *ip4vxlan-l2xcbase*: VXLAN over IPv4 tunnels with L2 cross-connect.
-- *ip4lispip4-ip4base*: LISP over IPv4 tunnels with IPv4 routing.
-- *ip4lispip6-ip6base*: LISP over IPv4 tunnels with IPv6 routing.
-
-In all cases listed above low number of MAC, IPv4, IPv6 flows (253 per
-direction) is switched or routed by VPP.
-
-In addition selected IPv4 tunnels are tested at scale:
-
-- *dot1q--ip4vxlanscale-l2bd*: VXLAN over IPv4 tunnels with L2 bridge-
- domain MAC switching, with scaled up dot1q VLANs (10, 100, 1k),
- mapped to scaled up L2 bridge-domains (10, 100, 1k), that are in turn
- mapped to (10, 100, 1k) VXLAN tunnels. 64.5k flows are transmitted per
- direction.
-
-IPv6 Tunnels
-~~~~~~~~~~~~
-
-VPP is tested in the following IPv6 tunnel baseline configurations:
-
-- *ip6lispip4-ip4base*: LISP over IPv4 tunnels with IPv4 routing.
-- *ip6lispip6-ip6base*: LISP over IPv4 tunnels with IPv6 routing.
-
-In all cases listed above low number of IPv4, IPv6 flows (253 per
-direction) is routed by VPP.
-
-VPP Features
-------------
-
-VPP is tested in a number of data plane feature configurations across
-different forwarding modes. Following sections list features tested.
-
-ACL Security-Groups
-~~~~~~~~~~~~~~~~~~~
-
-Both stateless and stateful access control lists (ACL), also known as
-security-groups, are supported by VPP.
-
-Following ACL configurations are tested for MAC switching with L2
-bridge-domains:
-
-- *l2bdbasemaclrn-iacl{E}sl-{F}flows*: Input stateless ACL, with {E}
- entries and {F} flows.
-- *l2bdbasemaclrn-oacl{E}sl-{F}flows*: Output stateless ACL, with {E}
- entries and {F} flows.
-- *l2bdbasemaclrn-iacl{E}sf-{F}flows*: Input stateful ACL, with {E}
- entries and {F} flows.
-- *l2bdbasemaclrn-oacl{E}sf-{F}flows*: Output stateful ACL, with {E}
- entries and {F} flows.
-
-Following ACL configurations are tested with IPv4 routing:
-
-- *ip4base-iacl{E}sl-{F}flows*: Input stateless ACL, with {E} entries
- and {F} flows.
-- *ip4base-oacl{E}sl-{F}flows*: Output stateless ACL, with {E} entries
- and {F} flows.
-- *ip4base-iacl{E}sf-{F}flows*: Input stateful ACL, with {E} entries and
- {F} flows.
-- *ip4base-oacl{E}sf-{F}flows*: Output stateful ACL, with {E} entries
- and {F} flows.
-
-ACL tests are executed with the following combinations of ACL entries
-and number of flows:
-
-- ACL entry definitions
-
- - flow non-matching deny entry: (src-ip4, dst-ip4, src-port, dst-port).
- - flow matching permit ACL entry: (src-ip4, dst-ip4).
-
-- {E} - number of non-matching deny ACL entries, {E} = [1, 10, 50].
-- {F} - number of UDP flows with different tuple (src-ip4, dst-ip4,
- src-port, dst-port), {F} = [100, 10k, 100k].
-- All {E}x{F} combinations are tested per ACL type, total of 9.
-
-ACL MAC-IP
-~~~~~~~~~~
-
-MAC-IP binding ACLs are tested for MAC switching with L2 bridge-domains:
-
-- *l2bdbasemaclrn-macip-iacl{E}sl-{F}flows*: Input stateless ACL, with
- {E} entries and {F} flows.
-
-MAC-IP ACL tests are executed with the following combinations of ACL
-entries and number of flows:
-
-- ACL entry definitions
-
- - flow non-matching deny entry: (dst-ip4, dst-mac, bit-mask)
- - flow matching permit ACL entry: (dst-ip4, dst-mac, bit-mask)
-
-- {E} - number of non-matching deny ACL entries, {E} = [1, 10, 50]
-- {F} - number of UDP flows with different tuple (dst-ip4, dst-mac),
- {F} = [100, 10k, 100k]
-- All {E}x{F} combinations are tested per ACL type, total of 9.
-
-NAT44
-~~~~~
-
-NAT44 is tested in baseline and scale configurations with IPv4 routing:
-
-- *ip4base-nat44*: baseline test with single NAT entry (addr, port),
- single UDP flow.
-- *ip4base-udpsrcscale{U}-nat44*: baseline test with {U} NAT entries
- (addr, {U}ports), {U}=15.
-- *ip4scale{R}-udpsrcscale{U}-nat44*: scale tests with {R}*{U} NAT
- entries ({R}addr, {U}ports), {R}=[100, 1k, 2k, 4k], {U}=15.
-
-Data Plane Throughput
----------------------
-
-Network data plane packet and bandwidth throughput are measured in
-accordance with :rfc:`2544`, using FD.io CSIT Multiple Loss Ratio search
-(MLRsearch), an optimized throughput search algorithm, that measures
-SUT/DUT packet throughput rates at different Packet Loss Ratio (PLR)
-values.
-
-Following MLRsearch values are measured across a range of L2 frame sizes
-and reported:
-
-- NON DROP RATE (NDR): packet and bandwidth throughput at PLR=0%.
-
- - **Aggregate packet rate**: NDR_LOWER <bi-directional packet rate>
- pps.
- - **Aggregate bandwidth rate**: NDR_LOWER <bi-directional bandwidth
- rate> Gbps.
-
-- PARTIAL DROP RATE (PDR): packet and bandwidth throughput at PLR=0.5%.
-
- - **Aggregate packet rate**: PDR_LOWER <bi-directional packet rate>
- pps.
- - **Aggregate bandwidth rate**: PDR_LOWER <bi-directional bandwidth
- rate> Gbps.
-
-NDR and PDR are measured for the following L2 frame sizes (untagged
-Ethernet):
-
-- IPv4 payload: 64B, IMIX (28x64B, 16x570B, 4x1518B), 1518B, 9000B.
-- IPv6 payload: 78B, IMIX (28x78B, 16x570B, 4x1518B), 1518B, 9000B.
-
-All rates are reported from external Traffic Generator perspective.
-
-.. _mlrsearch_algorithm:
-
-MLRsearch Tests
----------------
-
-Multiple Loss Rate search (MLRsearch) tests use new search algorithm
-implemented in FD.io CSIT project. MLRsearch discovers multiple packet
-throughput rates in a single search, with each rate associated with a
-distinct Packet Loss Ratio (PLR) criteria. MLRsearch is being
-standardized in IETF with `draft-vpolak-mkonstan-mlrsearch-XX
-<https://tools.ietf.org/html/draft-vpolak-mkonstan-mlrsearch-00>`_.
-
-Two throughput measurements used in FD.io CSIT are Non-Drop Rate (NDR,
-with zero packet loss, PLR=0) and Partial Drop Rate (PDR, with packet
-loss rate not greater than the configured non-zero PLR). MLRsearch
-discovers NDR and PDR in a single pass reducing required execution time
-compared to separate binary searches for NDR and PDR. MLRsearch reduces
-execution time even further by relying on shorter trial durations
-of intermediate steps, with only the final measurements
-conducted at the specified final trial duration.
-This results in the shorter overall search
-execution time when compared to a standard NDR/PDR binary search,
-while guaranteeing the same or similar results.
-
-If needed, MLRsearch can be easily adopted to discover more throughput rates
-with different pre-defined PLRs.
-
-.. Note:: All throughput rates are *always* bi-directional
- aggregates of two equal (symmetric) uni-directional packet rates
- received and reported by an external traffic generator.
-
-Overview
-~~~~~~~~
-
-The main properties of MLRsearch:
-
-- MLRsearch is a duration aware multi-phase multi-rate search algorithm.
-
- - Initial phase determines promising starting interval for the search.
- - Intermediate phases progress towards defined final search criteria.
- - Final phase executes measurements according to the final search
- criteria.
-
-- *Initial phase*:
-
- - Uses link rate as a starting transmit rate and discovers the Maximum
- Receive Rate (MRR) used as an input to the first intermediate phase.
-
-- *Intermediate phases*:
-
- - Start with initial trial duration (in the first phase) and converge
- geometrically towards the final trial duration (in the final phase).
- - Track two values for NDR and two for PDR.
-
- - The values are called (NDR or PDR) lower_bound and upper_bound.
- - Each value comes from a specific trial measurement
- (most recent for that transmit rate),
- and as such the value is associated with that measurement's duration and loss.
- - A bound can be invalid, for example if NDR lower_bound
- has been measured with nonzero loss.
- - Invalid bounds are not real boundaries for the searched value,
- but are needed to track interval widths.
- - Valid bounds are real boundaries for the searched value.
- - Each non-initial phase ends with all bounds valid.
-
- - Start with a large (lower_bound, upper_bound) interval width and
- geometrically converge towards the width goal (measurement resolution)
- of the phase. Each phase halves the previous width goal.
- - Use internal and external searches:
-
- - External search - measures at transmit rates outside the (lower_bound,
- upper_bound) interval. Activated when a bound is invalid,
- to search for a new valid bound by doubling the interval width.
- It is a variant of `exponential search`_.
- - Internal search - `binary search`_, measures at transmit rates within the
- (lower_bound, upper_bound) valid interval, halving the interval width.
-
-- *Final phase* is executed with the final test trial duration, and the final
- width goal that determines resolution of the overall search.
- Intermediate phases together with the final phase are called non-initial phases.
-
-The main benefits of MLRsearch vs. binary search include:
-
-- In general MLRsearch is likely to execute more search trials overall, but
- less trials at a set final duration.
-- In well behaving cases it greatly reduces (>50%) the overall duration
- compared to a single PDR (or NDR) binary search duration,
- while finding multiple drop rates.
-- In all cases MLRsearch yields the same or similar results to binary search.
-- Note: both binary search and MLRsearch are susceptible to reporting
- non-repeatable results across multiple runs for very bad behaving
- cases.
-
-Caveats:
-
-- Worst case MLRsearch can take longer than a binary search e.g. in case of
- drastic changes in behaviour for trials at varying durations.
-
-Search Implementation
-~~~~~~~~~~~~~~~~~~~~~
-
-Following is a brief description of the current MLRsearch
-implementation in FD.io CSIT.
-
-Input Parameters
-````````````````
-
-#. *maximum_transmit_rate* - maximum packet transmit rate to be used by
- external traffic generator, limited by either the actual Ethernet
- link rate or traffic generator NIC model capabilities. Sample
- defaults: 2 * 14.88 Mpps for 64B 10GE link rate,
- 2 * 18.75 Mpps for 64B 40GE NIC maximum rate.
-#. *minimum_transmit_rate* - minimum packet transmit rate to be used for
- measurements. MLRsearch fails if lower transmit rate needs to be
- used to meet search criteria. Default: 2 * 10 kpps (could be higher).
-#. *final_trial_duration* - required trial duration for final rate
- measurements. Default: 30 sec.
-#. *initial_trial_duration* - trial duration for initial MLRsearch phase.
- Default: 1 sec.
-#. *final_relative_width* - required measurement resolution expressed as
- (lower_bound, upper_bound) interval width relative to upper_bound.
- Default: 0.5%.
-#. *packet_loss_ratio* - maximum acceptable PLR search criteria for
- PDR measurements. Default: 0.5%.
-#. *number_of_intermediate_phases* - number of phases between the initial
- phase and the final phase. Impacts the overall MLRsearch duration.
- Less phases are required for well behaving cases, more phases
- may be needed to reduce the overall search duration for worse behaving cases.
- Default (2). (Value chosen based on limited experimentation to date.
- More experimentation needed to arrive to clearer guidelines.)
-
-Initial Phase
-`````````````
-
-1. First trial measures at maximum rate and discovers MRR.
-
- a. *in*: trial_duration = initial_trial_duration.
- b. *in*: offered_transmit_rate = maximum_transmit_rate.
- c. *do*: single trial.
- d. *out*: measured loss ratio.
- e. *out*: mrr = measured receive rate.
-
-2. Second trial measures at MRR and discovers MRR2.
-
- a. *in*: trial_duration = initial_trial_duration.
- b. *in*: offered_transmit_rate = MRR.
- c. *do*: single trial.
- d. *out*: measured loss ratio.
- e. *out*: mrr2 = measured receive rate.
-
-3. Third trial measures at MRR2.
-
- a. *in*: trial_duration = initial_trial_duration.
- b. *in*: offered_transmit_rate = MRR2.
- c. *do*: single trial.
- d. *out*: measured loss ratio.
-
-Non-initial Phases
-``````````````````
-
-1. Main loop:
-
- a. *in*: trial_duration for the current phase.
- Set to initial_trial_duration for the first intermediate phase;
- to final_trial_duration for the final phase;
- or to the element of interpolating geometric sequence
- for other intermediate phases.
- For example with two intermediate phases, trial_duration
- of the second intermediate phase is the geometric average
- of initial_strial_duration and final_trial_duration.
- b. *in*: relative_width_goal for the current phase.
- Set to final_relative_width for the final phase;
- doubled for each preceding phase.
- For example with two intermediate phases,
- the first intermediate phase uses quadruple of final_relative_width
- and the second intermediate phase uses double of final_relative_width.
- c. *in*: ndr_interval, pdr_interval from the previous main loop iteration
- or the previous phase.
- If the previous phase is the initial phase, both intervals have
- lower_bound = MRR2, uper_bound = MRR.
- Note that the initial phase is likely to create intervals with invalid bounds.
- d. *do*: According to the procedure described in point 2,
- either exit the phase (by jumping to 1.g.),
- or prepare new transmit rate to measure with.
- e. *do*: Perform the trial measurement at the new transmit rate
- and trial_duration, compute its loss ratio.
- f. *do*: Update the bounds of both intervals, based on the new measurement.
- The actual update rules are numerous, as NDR external search
- can affect PDR interval and vice versa, but the result
- agrees with rules of both internal and external search.
- For example, any new measurement below an invalid lower_bound
- becomes the new lower_bound, while the old measurement
- (previously acting as the invalid lower_bound)
- becomes a new and valid upper_bound.
- Go to next iteration (1.c.), taking the updated intervals as new input.
- g. *out*: current ndr_interval and pdr_interval.
- In the final phase this is also considered
- to be the result of the whole search.
- For other phases, the next phase loop is started
- with the current results as an input.
-
-2. New transmit rate (or exit) calculation (for 1.d.):
-
- - If there is an invalid bound then prepare for external search:
-
- - *If* the most recent measurement at NDR lower_bound transmit rate
- had the loss higher than zero, then
- the new transmit rate is NDR lower_bound
- decreased by two NDR interval widths.
- - Else, *if* the most recent measurement at PDR lower_bound
- transmit rate had the loss higher than PLR, then
- the new transmit rate is PDR lower_bound
- decreased by two PDR interval widths.
- - Else, *if* the most recent measurement at NDR upper_bound
- transmit rate had no loss, then
- the new transmit rate is NDR upper_bound
- increased by two NDR interval widths.
- - Else, *if* the most recent measurement at PDR upper_bound
- transmit rate had the loss lower or equal to PLR, then
- the new transmit rate is PDR upper_bound
- increased by two PDR interval widths.
- - If interval width is higher than the current phase goal:
-
- - Else, *if* NDR interval does not meet the current phase width goal,
- prepare for internal search. The new transmit rate is
- (NDR lower bound + NDR upper bound) / 2.
- - Else, *if* PDR interval does not meet the current phase width goal,
- prepare for internal search. The new transmit rate is
- (PDR lower bound + PDR upper bound) / 2.
- - Else, *if* some bound has still only been measured at a lower duration,
- prepare to re-measure at the current duration (and the same transmit rate).
- The order of priorities is:
-
- - NDR lower_bound,
- - PDR lower_bound,
- - NDR upper_bound,
- - PDR upper_bound.
- - *Else*, do not prepare any new rate, to exit the phase.
- This ensures that at the end of each non-initial phase
- all intervals are valid, narrow enough, and measured
- at current phase trial duration.
-
-Implementation Deviations
-~~~~~~~~~~~~~~~~~~~~~~~~~
-
-This document so far has been describing a simplified version of MLRsearch algorithm.
-The full algorithm as implemented contains additional logic,
-which makes some of the details (but not general ideas) above incorrect.
-Here is a short description of the additional logic as a list of principles,
-explaining their main differences from (or additions to) the simplified description,
-but without detailing their mutual interaction.
-
-1. *Logarithmic transmit rate.*
- In order to better fit the relative width goal,
- the interval doubling and halving is done differently.
- For example, the middle of 2 and 8 is 4, not 5.
-2. *Optimistic maximum rate.*
- The increased rate is never higher than the maximum rate.
- Upper bound at that rate is always considered valid.
-3. *Pessimistic minimum rate.*
- The decreased rate is never lower than the minimum rate.
- If a lower bound at that rate is invalid,
- a phase stops refining the interval further (until it gets re-measured).
-4. *Conservative interval updates.*
- Measurements above current upper bound never update a valid upper bound,
- even if drop ratio is low.
- Measurements below current lower bound always update any lower bound
- if drop ratio is high.
-5. *Ensure sufficient interval width.*
- Narrow intervals make external search take more time to find a valid bound.
- If the new transmit increased or decreased rate would result in width
- less than the current goal, increase/decrease more.
- This can happen if the measurement for the other interval
- makes the current interval too narrow.
- Similarly, take care the measurements in the initial phase
- create wide enough interval.
-6. *Timeout for bad cases.*
- The worst case for MLRsearch is when each phase converges to intervals
- way different than the results of the previous phase.
- Rather than suffer total search time several times larger
- than pure binary search, the implemented tests fail themselves
- when the search takes too long (given by argument *timeout*).
-
-(B)MRR Throughput
------------------
-
-Maximum Receive Rate (MRR) tests are complementary to MLRsearch tests,
-as they provide a maximum "raw" throughput benchmark for development and
-testing community. MRR tests measure the packet forwarding rate under
-the maximum load offered by traffic generator over a set trial duration,
-regardless of packet loss. Maximum load for specified Ethernet frame
-size is set to the bi-directional link rate.
-
-In |csit-release| MRR test code has been updated with a configurable
-burst MRR parameters: trial duration and number of trials in a single
-burst. This enabled a new Burst MRR (BMRR) methodology for more precise
-performance trending.
-
-Current parameters for BMRR tests:
-
-- Ethernet frame sizes: 64B (78B for IPv6), IMIX, 1518B, 9000B; all
- quoted sizes include frame CRC, but exclude per frame transmission
- overhead of 20B (preamble, inter frame gap).
-
-- Maximum load offered: 10GE and 40GE link (sub-)rates depending on NIC
- tested, with the actual packet rate depending on frame size,
- transmission overhead and traffic generator NIC forwarding capacity.
-
- - For 10GE NICs the maximum packet rate load is 2* 14.88 Mpps for 64B,
- a 10GE bi-directional link rate.
- - For 25GE NICs the maximum packet rate load is 2* 18.75 Mpps for 64B,
- a 25GE bi-directional link sub-rate limited by TG 25GE NIC used,
- XXV710.
- - For 40GE NICs the maximum packet rate load is 2* 18.75 Mpps for 64B,
- a 40GE bi-directional link sub-rate limited by TG 40GE NIC used,
- XL710. Packet rate for other tested frame sizes is limited by PCIe
- Gen3 x8 bandwidth limitation of ~50Gbps.
-
-- Trial duration: 1 sec.
-
-- Number of trials per burst: 10.
-
-Similarly to NDR/PDR throughput tests, MRR test should be reporting bi-
-directional link rate (or NIC rate, if lower) if tested VPP
-configuration can handle the packet rate higher than bi-directional link
-rate, e.g. large packet tests and/or multi-core tests.
-
-MRR tests are currently used for FD.io CSIT continuous performance
-trending and for comparison between releases. Daily trending job tests
-subset of frame sizes, focusing on 64B (78B for IPv6) for all tests and
-IMIX for selected tests (vhost, memif).
-
-MRR-like measurements are being used to establish starting conditions
-for experimental Probabilistic Loss Ratio Search (PLRsearch) used for
-soak testing, aimed at verifying continuous system performance over an
-extended period of time, hours, days, weeks, months. PLRsearch code is
-currently in experimental phase in FD.io CSIT project.
-
-Packet Latency
---------------
-
-TRex Traffic Generator (TG) is used for measuring latency of VPP DUTs.
-Reported latency values are measured using following methodology:
-
-- Latency tests are performed at 100% of discovered NDR and PDR rates
- for each throughput test and packet size (except IMIX).
-- TG sends dedicated latency streams, one per direction, each at the
- rate of 9 kpps at the prescribed packet size; these are sent in
- addition to the main load streams.
-- TG reports min/avg/max latency values per stream direction, hence two
- sets of latency values are reported per test case; future release of
- TRex is expected to report latency percentiles.
-- Reported latency values are aggregate across two SUTs due to three
- node topology used for all performance tests; for per SUT latency,
- reported value should be divided by two.
-- 1usec is the measurement accuracy advertised by TRex TG for the setup
- used in FD.io labs used by CSIT project.
-- TRex setup introduces an always-on error of about 2*2usec per latency
- flow additonal Tx/Rx interface latency induced by TRex SW writing and
- reading packet timestamps on CPU cores without HW acceleration on NICs
- closer to the interface line.
-
-Multi-Core Speedup
-------------------
-
-All performance tests are executed with single processor core and with
-multiple cores scenarios.
-
-Intel Hyper-Threading (HT)
-~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-Intel Xeon processors used in FD.io CSIT can operate either in HT
-Disabled mode (single logical core per each physical core) or in HT
-Enabled mode (two logical cores per each physical core). HT setting is
-applied in BIOS and requires server SUT reload for it to take effect,
-making it impractical for continuous changes of HT mode of operation.
-
-|csit-release| performance tests are executed with server SUTs' Intel
-XEON processors configured with Intel Hyper-Threading Disabled for all
-Xeon Haswell testbeds (3n-hsw) and with Intel Hyper-Threading Enabled
-for all Xeon Skylake testbeds.
-
-More information about physical testbeds is provided in
-:ref:`tested_physical_topologies`.
-
-Multi-core Tests
-~~~~~~~~~~~~~~~~
-
-|csit-release| multi-core tests are executed in the following VPP worker
-thread and physical core configurations:
-
-#. Intel Xeon Haswell testbeds (3n-hsw) with Intel HT disabled
- (1 logical CPU core per each physical core):
-
- #. 1t1c - 1 VPP worker thread on 1 physical core.
- #. 2t2c - 2 VPP worker threads on 2 physical cores.
- #. 4t4c - 4 VPP worker threads on 4 physical cores.
-
-#. Intel Xeon Skylake testbeds (2n-skx, 3n-skx) with Intel HT enabled
- (2 logical CPU cores per each physical core):
-
- #. 2t1c - 2 VPP worker threads on 1 physical core.
- #. 4t2c - 4 VPP worker threads on 2 physical cores.
- #. 8t4c - 8 VPP worker threads on 4 physical cores.
-
-VPP worker threads are the data plane threads running on isolated
-logical cores. With Intel HT enabled VPP workers are placed as sibling
-threads on each used physical core. VPP control threads (main, stats)
-are running on a separate non-isolated core together with other Linux
-processes.
-
-In all CSIT tests care is taken to ensure that each VPP worker handles
-the same amount of received packet load and does the same amount of
-packet processing work. This is achieved by evenly distributing per
-interface type (e.g. physical, virtual) receive queues over VPP workers
-using default VPP round- robin mapping and by loading these queues with
-the same amount of packet flows.
-
-If number of VPP workers is higher than number of physical or virtual
-interfaces, multiple receive queues are configured on each interface.
-NIC Receive Side Scaling (RSS) for physical interfaces and multi-queue
-for virtual interfaces are used for this purpose.
-
-Section :ref:`throughput_speedup_multi_core` includes a set of graphs
-illustrating packet throughout speedup when running VPP worker threads
-on multiple cores. Note that in quite a few test cases running VPP
-workers on 2 or 4 physical cores hits the I/O bandwidth or packets-per-
-second limit of tested NIC.
-
-VPP Startup Settings
---------------------
-
-CSIT code manipulates a number of VPP settings in startup.conf for optimized
-performance. List of common settings applied to all tests and test
-dependent settings follows.
-
-See `VPP startup.conf <https://git.fd.io/vpp/tree/src/vpp/conf/startup.conf?h=stable/1807>`_
-for a complete set and description of listed settings.
-
-Common Settings
-~~~~~~~~~~~~~~~
-
-List of vpp startup.conf settings applied to all tests:
-
-#. heap-size <value> - set separately for ip4, ip6, stats, main
- depending on scale tested.
-#. no-tx-checksum-offload - disables UDP / TCP TX checksum offload in DPDK.
- Typically needed for use faster vector PMDs (together with
- no-multi-seg).
-#. socket-mem <value>,<value> - memory per numa. (Not required anymore
- due to VPP code changes, should be removed in CSIT-18.10.)
-
-Per Test Settings
-~~~~~~~~~~~~~~~~~
-
-List of vpp startup.conf settings applied dynamically per test:
-
-#. corelist-workers <list_of_cores> - list of logical cores to run VPP
- worker data plane threads. Depends on HyperThreading and core per
- test configuration.
-#. num-rx-queues <value> - depends on a number of VPP threads and NIC
- interfaces.
-#. num-rx-desc/num-tx-desc - number of rx/tx descriptors for specific
- NICs, incl. xl710, x710, xxv710.
-#. num-mbufs <value> - increases number of buffers allocated, needed
- only in scenarios with large number of interfaces and worker threads.
- Value is per CPU socket. Default is 16384.
-#. no-multi-seg - disables multi-segment buffers in DPDK, improves
- packet throughput, but disables Jumbo MTU support. Disabled for all
- tests apart from the ones that require Jumbo 9000B frame support.
-#. UIO driver - depends on topology file definition.
-#. QAT VFs - depends on NRThreads, each thread = 1QAT VFs.
-
-KVM VMs vhost-user
-------------------
-
-FD.io CSIT performance lab is testing VPP vhost with KVM VMs using
-following environment settings:
-
-- Tests with varying Qemu virtio queue (a.k.a. vring) sizes: [vr256]
- default 256 descriptors, [vr1024] 1024 descriptors to optimize for
- packet throughput.
-- Tests with varying Linux :abbr:`CFS (Completely Fair Scheduler)`
- settings: [cfs] default settings, [cfsrr1] CFS RoundRobin(1) policy
- applied to all data plane threads handling test packet path including
- all VPP worker threads and all Qemu testpmd poll-mode threads.
-- Resulting test cases are all combinations with [vr256,vr1024] and
- [cfs,cfsrr1] settings.
-- Adjusted Linux kernel :abbr:`CFS (Completely Fair Scheduler)`
- scheduler policy for data plane threads used in CSIT is documented in
- `CSIT Performance Environment Tuning wiki
- <https://wiki.fd.io/view/CSIT/csit-perf-env-tuning-ubuntu1604>`_.
-- The purpose is to verify performance impact (MRR and NDR/PDR
- throughput) and same test measurements repeatability, by making VPP
- and VM data plane threads less susceptible to other Linux OS system
- tasks hijacking CPU cores running those data plane threads.
-
-LXC/DRC Container Memif
------------------------
-
-|csit-release| includes tests taking advantage of VPP memif virtual
-interface (shared memory interface) to interconnect VPP running in
-Containers. VPP vswitch instance runs in bare-metal user-mode handling
-NIC interfaces and connecting over memif (Slave side) to VPPs running in
-:abbr:`Linux Container (LXC)` or in Docker Container (DRC) configured
-with memif (Master side). LXCs and DRCs run in a priviliged mode with
-VPP data plane worker threads pinned to dedicated physical CPU cores per
-usual CSIT practice. All VPP instances run the same version of software.
-This test topology is equivalent to existing tests with vhost-user and
-VMs as described earlier in :ref:`tested_logical_topologies`.
-
-In addition to above vswitch tests, a single memif interface test is
-executed. It runs in a simple topology of two VPP container instances
-connected over memif interface in order to verify standalone memif
-interface performance.
-
-More information about CSIT LXC and DRC setup and control is available
-in :ref:`container_orchestration_in_csit`.
-
-K8s Container Memif
--------------------
-
-|csit-release| includes tests of VPP topologies running in K8s
-orchestrated Pods/Containers and connected over memif virtual
-interfaces. In order to provide simple topology coding flexibility and
-extensibility container orchestration is done with `Kubernetes
-<https://github.com/kubernetes>`_ using `Docker
-<https://github.com/docker>`_ images for all container applications
-including VPP. `Ligato <https://github.com/ligato>`_ is used for the
-Pod/Container networking orchestration that is integrated with K8s,
-including memif support.
-
-In these tests VPP vswitch runs in a K8s Pod with Docker Container (DRC)
-handling NIC interfaces and connecting over memif to more instances of
-VPP running in Pods/DRCs. All DRCs run in a priviliged mode with VPP
-data plane worker threads pinned to dedicated physical CPU cores per
-usual CSIT practice. All VPP instances run the same version of software.
-This test topology is equivalent to existing tests with vhost-user and
-VMs as described earlier in :ref:`tested_physical_topologies`.
-
-Further documentation is available in
-:ref:`container_orchestration_in_csit`.
-
-VPP_Device Functional
----------------------
-
-|csit-release| added new VPP_Device test environment for functional VPP
-device tests integrated into LFN CI/CD infrastructure. VPP_Device tests
-run on 1-Node testbeds (1n-skx, 1n-arm) and rely on Linux SRIOV Virtual
-Function (VF), dot1q VLAN tagging and external loopback cables to
-facilitate packet passing over exernal physical links. Initial focus is
-on few baseline tests. Existing CSIT VIRL tests can be moved to
-VPP_Device framework by changing L1 and L2 KW(s). RF test definition
-code stays unchanged with the exception of requiring adjustments from
-3-Node to 2-Node logical topologies. CSIT VIRL to VPP_Device migration
-is expected in the next CSIT release.
-
-IPSec on Intel QAT
-------------------
-
-VPP IPSec performance tests are using DPDK cryptodev device driver in
-combination with HW cryptodev devices - Intel QAT 8950 50G - present in
-LF FD.io physical testbeds. DPDK cryptodev can be used for all IPSec
-data plane functions supported by VPP.
-
-Currently |csit-release| implements following IPSec test cases:
-
-- AES-GCM, CBC-SHA1 ciphers, in combination with IPv4 routed-forwarding
- with Intel xl710 NIC.
-- CBC-SHA1 ciphers, in combination with LISP-GPE overlay tunneling for
- IPv4-over-IPv4 with Intel xl710 NIC.
-
-TRex Traffic Generator
-----------------------
-
-Usage
-~~~~~
-
-`TRex traffic generator <https://wiki.fd.io/view/TRex>`_ is used for all
-CSIT performance tests. TRex stateless mode is used to measure NDR and
-PDR throughputs using binary search (NDR and PDR discovery tests) and
-for quick checks of DUT performance against the reference NDRs (NDR
-check tests) for specific configuration.
-
-TRex is installed and run on the TG compute node. The typical procedure
-is:
-
-- If the TRex is not already installed on TG, it is installed in the
- suite setup phase - see `TRex intallation`_.
-- TRex configuration is set in its configuration file
- ::
-
- /etc/trex_cfg.yaml
-
-- TRex is started in the background mode
- ::
-
- $ sh -c 'cd <t-rex-install-dir>/scripts/ && sudo nohup ./t-rex-64 -i -c 7 --iom 0 > /tmp/trex.log 2>&1 &' > /dev/null
-
-- There are traffic streams dynamically prepared for each test, based on traffic
- profiles. The traffic is sent and the statistics obtained using
- :command:`trex_stl_lib.api.STLClient`.
-
-Measuring Packet Loss
-~~~~~~~~~~~~~~~~~~~~~
-
-Following sequence is followed to measure packet loss:
-
-- Create an instance of STLClient.
-- Connect to the client.
-- Add all streams.
-- Clear statistics.
-- Send the traffic for defined time.
-- Get the statistics.
-
-If there is a warm-up phase required, the traffic is sent also before
-test and the statistics are ignored.
-
-Measuring Latency
-~~~~~~~~~~~~~~~~~
-
-If measurement of latency is requested, two more packet streams are
-created (one for each direction) with TRex flow_stats parameter set to
-STLFlowLatencyStats. In that case, returned statistics will also include
-min/avg/max latency values.
-
-HTTP/TCP with WRK Tool
-----------------------
-
-`WRK HTTP benchmarking tool <https://github.com/wg/wrk>`_ is used for
-experimental TCP/IP and HTTP tests of VPP TCP/IP stack and built-in
-static HTTP server. WRK has been chosen as it is capable of generating
-significant TCP/IP and HTTP loads by scaling number of threads across
-multi-core processors.
-
-This in turn enables quite high scale benchmarking of the main TCP/IP
-and HTTP service including HTTP TCP/IP Connections-Per-Second (CPS),
-HTTP Requests-Per-Second and HTTP Bandwidth Throughput.
-
-The initial tests are designed as follows:
-
-- HTTP and TCP/IP Connections-Per-Second (CPS)
-
- - WRK configured to use 8 threads across 8 cores, 1 thread per core.
- - Maximum of 50 concurrent connections across all WRK threads.
- - Timeout for server responses set to 5 seconds.
- - Test duration is 30 seconds.
- - Expected HTTP test sequence:
-
- - Single HTTP GET Request sent per open connection.
- - Connection close after valid HTTP reply.
- - Resulting flow sequence - 8 packets: >Syn, <Syn-Ack, >Ack, >Req,
- <Rep, >Fin, <Fin, >Ack.
-
-- HTTP Requests-Per-Second
-
- - WRK configured to use 8 threads across 8 cores, 1 thread per core.
- - Maximum of 50 concurrent connections across all WRK threads.
- - Timeout for server responses set to 5 seconds.
- - Test duration is 30 seconds.
- - Expected HTTP test sequence:
-
- - Multiple HTTP GET Requests sent in sequence per open connection.
- - Connection close after set test duration time.
- - Resulting flow sequence: >Syn, <Syn-Ack, >Ack, >Req[1], <Rep[1],
- .., >Req[n], <Rep[n], >Fin, <Fin, >Ack.
-
-.. _binary search: https://en.wikipedia.org/wiki/Binary_search
-.. _exponential search: https://en.wikipedia.org/wiki/Exponential_search
-.. _estimation of standard deviation: https://en.wikipedia.org/wiki/Unbiased_estimation_of_standard_deviation
-.. _simplified error propagation formula: https://en.wikipedia.org/wiki/Propagation_of_uncertainty#Simplification
+.. toctree::
+
+ methodology_vpp_forwarding_modes
+ methodology_tunnel_encapsulations
+ methodology_vpp_features
+ methodology_data_plane_throughput
+ methodology_mlrsearch_tests
+ methodology_bmrr_throughput
+ methodology_packet_latency
+ methodology_multi_core_speedup
+ methodology_vpp_startup_settings
+ methodology_kvm_vms_vhost_user
+ methodology_lxc_drc_container_memif
+ methodology_k8s_container_memif
+ methodology_vpp_device_functional
+ methodology_ipsec_on_intel_qat
+ methodology_trex_traffic_generator
+ methodology_http_tcp_with_wrk_tool
--- /dev/null
+(B)MRR Throughput
+-----------------
+
+Maximum Receive Rate (MRR) tests are complementary to MLRsearch tests,
+as they provide a maximum "raw" throughput benchmark for development and
+testing community. MRR tests measure the packet forwarding rate under
+the maximum load offered by traffic generator over a set trial duration,
+regardless of packet loss. Maximum load for specified Ethernet frame
+size is set to the bi-directional link rate.
+
+In |csit-release| MRR test code has been updated with a configurable
+burst MRR parameters: trial duration and number of trials in a single
+burst. This enabled a new Burst MRR (BMRR) methodology for more precise
+performance trending.
+
+Current parameters for BMRR tests:
+
+- Ethernet frame sizes: 64B (78B for IPv6), IMIX, 1518B, 9000B; all
+ quoted sizes include frame CRC, but exclude per frame transmission
+ overhead of 20B (preamble, inter frame gap).
+
+- Maximum load offered: 10GE and 40GE link (sub-)rates depending on NIC
+ tested, with the actual packet rate depending on frame size,
+ transmission overhead and traffic generator NIC forwarding capacity.
+
+ - For 10GE NICs the maximum packet rate load is 2* 14.88 Mpps for 64B,
+ a 10GE bi-directional link rate.
+ - For 25GE NICs the maximum packet rate load is 2* 18.75 Mpps for 64B,
+ a 25GE bi-directional link sub-rate limited by TG 25GE NIC used,
+ XXV710.
+ - For 40GE NICs the maximum packet rate load is 2* 18.75 Mpps for 64B,
+ a 40GE bi-directional link sub-rate limited by TG 40GE NIC used,
+ XL710. Packet rate for other tested frame sizes is limited by PCIe
+ Gen3 x8 bandwidth limitation of ~50Gbps.
+
+- Trial duration: 1 sec.
+
+- Number of trials per burst: 10.
+
+Similarly to NDR/PDR throughput tests, MRR test should be reporting bi-
+directional link rate (or NIC rate, if lower) if tested VPP
+configuration can handle the packet rate higher than bi-directional link
+rate, e.g. large packet tests and/or multi-core tests.
+
+MRR tests are currently used for FD.io CSIT continuous performance
+trending and for comparison between releases. Daily trending job tests
+subset of frame sizes, focusing on 64B (78B for IPv6) for all tests and
+IMIX for selected tests (vhost, memif).
+
+MRR-like measurements are being used to establish starting conditions
+for experimental Probabilistic Loss Ratio Search (PLRsearch) used for
+soak testing, aimed at verifying continuous system performance over an
+extended period of time, hours, days, weeks, months. PLRsearch code is
+currently in experimental phase in FD.io CSIT project.
--- /dev/null
+Data Plane Throughput
+---------------------
+
+Network data plane packet and bandwidth throughput are measured in
+accordance with :rfc:`2544`, using FD.io CSIT Multiple Loss Ratio search
+(MLRsearch), an optimized throughput search algorithm, that measures
+SUT/DUT packet throughput rates at different Packet Loss Ratio (PLR)
+values.
+
+Following MLRsearch values are measured across a range of L2 frame sizes
+and reported:
+
+- NON DROP RATE (NDR): packet and bandwidth throughput at PLR=0%.
+
+ - **Aggregate packet rate**: NDR_LOWER <bi-directional packet rate>
+ pps.
+ - **Aggregate bandwidth rate**: NDR_LOWER <bi-directional bandwidth
+ rate> Gbps.
+
+- PARTIAL DROP RATE (PDR): packet and bandwidth throughput at PLR=0.5%.
+
+ - **Aggregate packet rate**: PDR_LOWER <bi-directional packet rate>
+ pps.
+ - **Aggregate bandwidth rate**: PDR_LOWER <bi-directional bandwidth
+ rate> Gbps.
+
+NDR and PDR are measured for the following L2 frame sizes (untagged
+Ethernet):
+
+- IPv4 payload: 64B, IMIX (28x64B, 16x570B, 4x1518B), 1518B, 9000B.
+- IPv6 payload: 78B, IMIX (28x78B, 16x570B, 4x1518B), 1518B, 9000B.
+
+All rates are reported from external Traffic Generator perspective.
--- /dev/null
+HTTP/TCP with WRK Tool
+----------------------
+
+`WRK HTTP benchmarking tool <https://github.com/wg/wrk>`_ is used for
+experimental TCP/IP and HTTP tests of VPP TCP/IP stack and built-in
+static HTTP server. WRK has been chosen as it is capable of generating
+significant TCP/IP and HTTP loads by scaling number of threads across
+multi-core processors.
+
+This in turn enables quite high scale benchmarking of the main TCP/IP
+and HTTP service including HTTP TCP/IP Connections-Per-Second (CPS),
+HTTP Requests-Per-Second and HTTP Bandwidth Throughput.
+
+The initial tests are designed as follows:
+
+- HTTP and TCP/IP Connections-Per-Second (CPS)
+
+ - WRK configured to use 8 threads across 8 cores, 1 thread per core.
+ - Maximum of 50 concurrent connections across all WRK threads.
+ - Timeout for server responses set to 5 seconds.
+ - Test duration is 30 seconds.
+ - Expected HTTP test sequence:
+
+ - Single HTTP GET Request sent per open connection.
+ - Connection close after valid HTTP reply.
+ - Resulting flow sequence - 8 packets: >Syn, <Syn-Ack, >Ack, >Req,
+ <Rep, >Fin, <Fin, >Ack.
+
+- HTTP Requests-Per-Second
+
+ - WRK configured to use 8 threads across 8 cores, 1 thread per core.
+ - Maximum of 50 concurrent connections across all WRK threads.
+ - Timeout for server responses set to 5 seconds.
+ - Test duration is 30 seconds.
+ - Expected HTTP test sequence:
+
+ - Multiple HTTP GET Requests sent in sequence per open connection.
+ - Connection close after set test duration time.
+ - Resulting flow sequence: >Syn, <Syn-Ack, >Ack, >Req[1], <Rep[1],
+ .., >Req[n], <Rep[n], >Fin, <Fin, >Ack.
--- /dev/null
+IPSec on Intel QAT
+------------------
+
+VPP IPSec performance tests are using DPDK cryptodev device driver in
+combination with HW cryptodev devices - Intel QAT 8950 50G - present in
+LF FD.io physical testbeds. DPDK cryptodev can be used for all IPSec
+data plane functions supported by VPP.
+
+Currently |csit-release| implements following IPSec test cases:
+
+- AES-GCM, CBC-SHA1 ciphers, in combination with IPv4 routed-forwarding
+ with Intel xl710 NIC.
+- CBC-SHA1 ciphers, in combination with LISP-GPE overlay tunneling for
+ IPv4-over-IPv4 with Intel xl710 NIC.
--- /dev/null
+K8s Container Memif
+-------------------
+
+|csit-release| includes tests of VPP topologies running in K8s
+orchestrated Pods/Containers and connected over memif virtual
+interfaces. In order to provide simple topology coding flexibility and
+extensibility container orchestration is done with `Kubernetes
+<https://github.com/kubernetes>`_ using `Docker
+<https://github.com/docker>`_ images for all container applications
+including VPP. `Ligato <https://github.com/ligato>`_ is used for the
+Pod/Container networking orchestration that is integrated with K8s,
+including memif support.
+
+In these tests VPP vswitch runs in a K8s Pod with Docker Container (DRC)
+handling NIC interfaces and connecting over memif to more instances of
+VPP running in Pods/DRCs. All DRCs run in a priviliged mode with VPP
+data plane worker threads pinned to dedicated physical CPU cores per
+usual CSIT practice. All VPP instances run the same version of software.
+This test topology is equivalent to existing tests with vhost-user and
+VMs as described earlier in :ref:`tested_physical_topologies`.
+
+Further documentation is available in
+:ref:`container_orchestration_in_csit`.
--- /dev/null
+KVM VMs vhost-user
+------------------
+
+FD.io CSIT performance lab is testing VPP vhost with KVM VMs using
+following environment settings:
+
+- Tests with varying Qemu virtio queue (a.k.a. vring) sizes: [vr256]
+ default 256 descriptors, [vr1024] 1024 descriptors to optimize for
+ packet throughput.
+- Tests with varying Linux :abbr:`CFS (Completely Fair Scheduler)`
+ settings: [cfs] default settings, [cfsrr1] CFS RoundRobin(1) policy
+ applied to all data plane threads handling test packet path including
+ all VPP worker threads and all Qemu testpmd poll-mode threads.
+- Resulting test cases are all combinations with [vr256,vr1024] and
+ [cfs,cfsrr1] settings.
+- Adjusted Linux kernel :abbr:`CFS (Completely Fair Scheduler)`
+ scheduler policy for data plane threads used in CSIT is documented in
+ `CSIT Performance Environment Tuning wiki
+ <https://wiki.fd.io/view/CSIT/csit-perf-env-tuning-ubuntu1604>`_.
+- The purpose is to verify performance impact (MRR and NDR/PDR
+ throughput) and same test measurements repeatability, by making VPP
+ and VM data plane threads less susceptible to other Linux OS system
+ tasks hijacking CPU cores running those data plane threads.
--- /dev/null
+LXC/DRC Container Memif
+-----------------------
+
+|csit-release| includes tests taking advantage of VPP memif virtual
+interface (shared memory interface) to interconnect VPP running in
+Containers. VPP vswitch instance runs in bare-metal user-mode handling
+NIC interfaces and connecting over memif (Slave side) to VPPs running in
+:abbr:`Linux Container (LXC)` or in Docker Container (DRC) configured
+with memif (Master side). LXCs and DRCs run in a priviliged mode with
+VPP data plane worker threads pinned to dedicated physical CPU cores per
+usual CSIT practice. All VPP instances run the same version of software.
+This test topology is equivalent to existing tests with vhost-user and
+VMs as described earlier in :ref:`tested_logical_topologies`.
+
+In addition to above vswitch tests, a single memif interface test is
+executed. It runs in a simple topology of two VPP container instances
+connected over memif interface in order to verify standalone memif
+interface performance.
+
+More information about CSIT LXC and DRC setup and control is available
+in :ref:`container_orchestration_in_csit`.
--- /dev/null
+
+.. _mlrsearch_algorithm:
+
+MLRsearch Tests
+---------------
+
+Multiple Loss Rate search (MLRsearch) tests use new search algorithm
+implemented in FD.io CSIT project. MLRsearch discovers multiple packet
+throughput rates in a single search, with each rate associated with a
+distinct Packet Loss Ratio (PLR) criteria. MLRsearch is being
+standardized in IETF with `draft-vpolak-mkonstan-mlrsearch-XX
+<https://tools.ietf.org/html/draft-vpolak-mkonstan-mlrsearch-00>`_.
+
+Two throughput measurements used in FD.io CSIT are Non-Drop Rate (NDR,
+with zero packet loss, PLR=0) and Partial Drop Rate (PDR, with packet
+loss rate not greater than the configured non-zero PLR). MLRsearch
+discovers NDR and PDR in a single pass reducing required execution time
+compared to separate binary searches for NDR and PDR. MLRsearch reduces
+execution time even further by relying on shorter trial durations
+of intermediate steps, with only the final measurements
+conducted at the specified final trial duration.
+This results in the shorter overall search
+execution time when compared to a standard NDR/PDR binary search,
+while guaranteeing the same or similar results.
+
+If needed, MLRsearch can be easily adopted to discover more throughput rates
+with different pre-defined PLRs.
+
+.. Note:: All throughput rates are *always* bi-directional
+ aggregates of two equal (symmetric) uni-directional packet rates
+ received and reported by an external traffic generator.
+
+Overview
+~~~~~~~~
+
+The main properties of MLRsearch:
+
+- MLRsearch is a duration aware multi-phase multi-rate search algorithm.
+
+ - Initial phase determines promising starting interval for the search.
+ - Intermediate phases progress towards defined final search criteria.
+ - Final phase executes measurements according to the final search
+ criteria.
+
+- *Initial phase*:
+
+ - Uses link rate as a starting transmit rate and discovers the Maximum
+ Receive Rate (MRR) used as an input to the first intermediate phase.
+
+- *Intermediate phases*:
+
+ - Start with initial trial duration (in the first phase) and converge
+ geometrically towards the final trial duration (in the final phase).
+ - Track two values for NDR and two for PDR.
+
+ - The values are called (NDR or PDR) lower_bound and upper_bound.
+ - Each value comes from a specific trial measurement
+ (most recent for that transmit rate),
+ and as such the value is associated with that measurement's duration and
+ loss.
+ - A bound can be invalid, for example if NDR lower_bound
+ has been measured with nonzero loss.
+ - Invalid bounds are not real boundaries for the searched value,
+ but are needed to track interval widths.
+ - Valid bounds are real boundaries for the searched value.
+ - Each non-initial phase ends with all bounds valid.
+
+ - Start with a large (lower_bound, upper_bound) interval width and
+ geometrically converge towards the width goal (measurement resolution)
+ of the phase. Each phase halves the previous width goal.
+ - Use internal and external searches:
+
+ - External search - measures at transmit rates outside the (lower_bound,
+ upper_bound) interval. Activated when a bound is invalid,
+ to search for a new valid bound by doubling the interval width.
+ It is a variant of `exponential search`_.
+ - Internal search - `binary search`_, measures at transmit rates within the
+ (lower_bound, upper_bound) valid interval, halving the interval width.
+
+- *Final phase* is executed with the final test trial duration, and the final
+ width goal that determines resolution of the overall search.
+ Intermediate phases together with the final phase are called non-initial
+ phases.
+
+The main benefits of MLRsearch vs. binary search include:
+
+- In general MLRsearch is likely to execute more search trials overall, but
+ less trials at a set final duration.
+- In well behaving cases it greatly reduces (>50%) the overall duration
+ compared to a single PDR (or NDR) binary search duration,
+ while finding multiple drop rates.
+- In all cases MLRsearch yields the same or similar results to binary search.
+- Note: both binary search and MLRsearch are susceptible to reporting
+ non-repeatable results across multiple runs for very bad behaving
+ cases.
+
+Caveats:
+
+- Worst case MLRsearch can take longer than a binary search e.g. in case of
+ drastic changes in behaviour for trials at varying durations.
+
+Search Implementation
+~~~~~~~~~~~~~~~~~~~~~
+
+Following is a brief description of the current MLRsearch
+implementation in FD.io CSIT.
+
+Input Parameters
+````````````````
+
+#. *maximum_transmit_rate* - maximum packet transmit rate to be used by
+ external traffic generator, limited by either the actual Ethernet
+ link rate or traffic generator NIC model capabilities. Sample
+ defaults: 2 * 14.88 Mpps for 64B 10GE link rate,
+ 2 * 18.75 Mpps for 64B 40GE NIC maximum rate.
+#. *minimum_transmit_rate* - minimum packet transmit rate to be used for
+ measurements. MLRsearch fails if lower transmit rate needs to be
+ used to meet search criteria. Default: 2 * 10 kpps (could be higher).
+#. *final_trial_duration* - required trial duration for final rate
+ measurements. Default: 30 sec.
+#. *initial_trial_duration* - trial duration for initial MLRsearch phase.
+ Default: 1 sec.
+#. *final_relative_width* - required measurement resolution expressed as
+ (lower_bound, upper_bound) interval width relative to upper_bound.
+ Default: 0.5%.
+#. *packet_loss_ratio* - maximum acceptable PLR search criteria for
+ PDR measurements. Default: 0.5%.
+#. *number_of_intermediate_phases* - number of phases between the initial
+ phase and the final phase. Impacts the overall MLRsearch duration.
+ Less phases are required for well behaving cases, more phases
+ may be needed to reduce the overall search duration for worse behaving
+ cases.
+ Default (2). (Value chosen based on limited experimentation to date.
+ More experimentation needed to arrive to clearer guidelines.)
+
+Initial Phase
+`````````````
+
+1. First trial measures at maximum rate and discovers MRR.
+
+ a. *in*: trial_duration = initial_trial_duration.
+ b. *in*: offered_transmit_rate = maximum_transmit_rate.
+ c. *do*: single trial.
+ d. *out*: measured loss ratio.
+ e. *out*: mrr = measured receive rate.
+
+2. Second trial measures at MRR and discovers MRR2.
+
+ a. *in*: trial_duration = initial_trial_duration.
+ b. *in*: offered_transmit_rate = MRR.
+ c. *do*: single trial.
+ d. *out*: measured loss ratio.
+ e. *out*: mrr2 = measured receive rate.
+
+3. Third trial measures at MRR2.
+
+ a. *in*: trial_duration = initial_trial_duration.
+ b. *in*: offered_transmit_rate = MRR2.
+ c. *do*: single trial.
+ d. *out*: measured loss ratio.
+
+Non-initial Phases
+``````````````````
+
+1. Main loop:
+
+ a. *in*: trial_duration for the current phase.
+ Set to initial_trial_duration for the first intermediate phase;
+ to final_trial_duration for the final phase;
+ or to the element of interpolating geometric sequence
+ for other intermediate phases.
+ For example with two intermediate phases, trial_duration
+ of the second intermediate phase is the geometric average
+ of initial_strial_duration and final_trial_duration.
+ b. *in*: relative_width_goal for the current phase.
+ Set to final_relative_width for the final phase;
+ doubled for each preceding phase.
+ For example with two intermediate phases,
+ the first intermediate phase uses quadruple of final_relative_width
+ and the second intermediate phase uses double of final_relative_width.
+ c. *in*: ndr_interval, pdr_interval from the previous main loop iteration
+ or the previous phase.
+ If the previous phase is the initial phase, both intervals have
+ lower_bound = MRR2, uper_bound = MRR.
+ Note that the initial phase is likely to create intervals with invalid
+ bounds.
+ d. *do*: According to the procedure described in point 2,
+ either exit the phase (by jumping to 1.g.),
+ or prepare new transmit rate to measure with.
+ e. *do*: Perform the trial measurement at the new transmit rate
+ and trial_duration, compute its loss ratio.
+ f. *do*: Update the bounds of both intervals, based on the new measurement.
+ The actual update rules are numerous, as NDR external search
+ can affect PDR interval and vice versa, but the result
+ agrees with rules of both internal and external search.
+ For example, any new measurement below an invalid lower_bound
+ becomes the new lower_bound, while the old measurement
+ (previously acting as the invalid lower_bound)
+ becomes a new and valid upper_bound.
+ Go to next iteration (1.c.), taking the updated intervals as new input.
+ g. *out*: current ndr_interval and pdr_interval.
+ In the final phase this is also considered
+ to be the result of the whole search.
+ For other phases, the next phase loop is started
+ with the current results as an input.
+
+2. New transmit rate (or exit) calculation (for 1.d.):
+
+ - If there is an invalid bound then prepare for external search:
+
+ - *If* the most recent measurement at NDR lower_bound transmit rate
+ had the loss higher than zero, then
+ the new transmit rate is NDR lower_bound
+ decreased by two NDR interval widths.
+ - Else, *if* the most recent measurement at PDR lower_bound
+ transmit rate had the loss higher than PLR, then
+ the new transmit rate is PDR lower_bound
+ decreased by two PDR interval widths.
+ - Else, *if* the most recent measurement at NDR upper_bound
+ transmit rate had no loss, then
+ the new transmit rate is NDR upper_bound
+ increased by two NDR interval widths.
+ - Else, *if* the most recent measurement at PDR upper_bound
+ transmit rate had the loss lower or equal to PLR, then
+ the new transmit rate is PDR upper_bound
+ increased by two PDR interval widths.
+ - If interval width is higher than the current phase goal:
+
+ - Else, *if* NDR interval does not meet the current phase width goal,
+ prepare for internal search. The new transmit rate is
+ (NDR lower bound + NDR upper bound) / 2.
+ - Else, *if* PDR interval does not meet the current phase width goal,
+ prepare for internal search. The new transmit rate is
+ (PDR lower bound + PDR upper bound) / 2.
+ - Else, *if* some bound has still only been measured at a lower duration,
+ prepare to re-measure at the current duration (and the same transmit
+ rate). The order of priorities is:
+
+ - NDR lower_bound,
+ - PDR lower_bound,
+ - NDR upper_bound,
+ - PDR upper_bound.
+ - *Else*, do not prepare any new rate, to exit the phase.
+ This ensures that at the end of each non-initial phase
+ all intervals are valid, narrow enough, and measured
+ at current phase trial duration.
+
+Implementation Deviations
+~~~~~~~~~~~~~~~~~~~~~~~~~
+
+This document so far has been describing a simplified version of MLRsearch
+algorithm. The full algorithm as implemented contains additional logic,
+which makes some of the details (but not general ideas) above incorrect.
+Here is a short description of the additional logic as a list of principles,
+explaining their main differences from (or additions to) the simplified
+description,but without detailing their mutual interaction.
+
+1. *Logarithmic transmit rate.*
+ In order to better fit the relative width goal,
+ the interval doubling and halving is done differently.
+ For example, the middle of 2 and 8 is 4, not 5.
+2. *Optimistic maximum rate.*
+ The increased rate is never higher than the maximum rate.
+ Upper bound at that rate is always considered valid.
+3. *Pessimistic minimum rate.*
+ The decreased rate is never lower than the minimum rate.
+ If a lower bound at that rate is invalid,
+ a phase stops refining the interval further (until it gets re-measured).
+4. *Conservative interval updates.*
+ Measurements above current upper bound never update a valid upper bound,
+ even if drop ratio is low.
+ Measurements below current lower bound always update any lower bound
+ if drop ratio is high.
+5. *Ensure sufficient interval width.*
+ Narrow intervals make external search take more time to find a valid bound.
+ If the new transmit increased or decreased rate would result in width
+ less than the current goal, increase/decrease more.
+ This can happen if the measurement for the other interval
+ makes the current interval too narrow.
+ Similarly, take care the measurements in the initial phase
+ create wide enough interval.
+6. *Timeout for bad cases.*
+ The worst case for MLRsearch is when each phase converges to intervals
+ way different than the results of the previous phase.
+ Rather than suffer total search time several times larger
+ than pure binary search, the implemented tests fail themselves
+ when the search takes too long (given by argument *timeout*).
+
+.. _binary search: https://en.wikipedia.org/wiki/Binary_search
+.. _exponential search: https://en.wikipedia.org/wiki/Exponential_search
+.. _estimation of standard deviation: https://en.wikipedia.org/wiki/Unbiased_estimation_of_standard_deviation
+.. _simplified error propagation formula: https://en.wikipedia.org/wiki/Propagation_of_uncertainty#Simplification
--- /dev/null
+Multi-Core Speedup
+------------------
+
+All performance tests are executed with single processor core and with
+multiple cores scenarios.
+
+Intel Hyper-Threading (HT)
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Intel Xeon processors used in FD.io CSIT can operate either in HT
+Disabled mode (single logical core per each physical core) or in HT
+Enabled mode (two logical cores per each physical core). HT setting is
+applied in BIOS and requires server SUT reload for it to take effect,
+making it impractical for continuous changes of HT mode of operation.
+
+|csit-release| performance tests are executed with server SUTs' Intel
+XEON processors configured with Intel Hyper-Threading Disabled for all
+Xeon Haswell testbeds (3n-hsw) and with Intel Hyper-Threading Enabled
+for all Xeon Skylake testbeds.
+
+More information about physical testbeds is provided in
+:ref:`tested_physical_topologies`.
+
+Multi-core Tests
+~~~~~~~~~~~~~~~~
+
+|csit-release| multi-core tests are executed in the following VPP worker
+thread and physical core configurations:
+
+#. Intel Xeon Haswell testbeds (3n-hsw) with Intel HT disabled
+ (1 logical CPU core per each physical core):
+
+ #. 1t1c - 1 VPP worker thread on 1 physical core.
+ #. 2t2c - 2 VPP worker threads on 2 physical cores.
+ #. 4t4c - 4 VPP worker threads on 4 physical cores.
+
+#. Intel Xeon Skylake testbeds (2n-skx, 3n-skx) with Intel HT enabled
+ (2 logical CPU cores per each physical core):
+
+ #. 2t1c - 2 VPP worker threads on 1 physical core.
+ #. 4t2c - 4 VPP worker threads on 2 physical cores.
+ #. 8t4c - 8 VPP worker threads on 4 physical cores.
+
+VPP worker threads are the data plane threads running on isolated
+logical cores. With Intel HT enabled VPP workers are placed as sibling
+threads on each used physical core. VPP control threads (main, stats)
+are running on a separate non-isolated core together with other Linux
+processes.
+
+In all CSIT tests care is taken to ensure that each VPP worker handles
+the same amount of received packet load and does the same amount of
+packet processing work. This is achieved by evenly distributing per
+interface type (e.g. physical, virtual) receive queues over VPP workers
+using default VPP round- robin mapping and by loading these queues with
+the same amount of packet flows.
+
+If number of VPP workers is higher than number of physical or virtual
+interfaces, multiple receive queues are configured on each interface.
+NIC Receive Side Scaling (RSS) for physical interfaces and multi-queue
+for virtual interfaces are used for this purpose.
+
+Section :ref:`throughput_speedup_multi_core` includes a set of graphs
+illustrating packet throughout speedup when running VPP worker threads
+on multiple cores. Note that in quite a few test cases running VPP
+workers on 2 or 4 physical cores hits the I/O bandwidth or packets-per-
+second limit of tested NIC.
--- /dev/null
+Packet Latency
+--------------
+
+TRex Traffic Generator (TG) is used for measuring latency of VPP DUTs.
+Reported latency values are measured using following methodology:
+
+- Latency tests are performed at 100% of discovered NDR and PDR rates
+ for each throughput test and packet size (except IMIX).
+- TG sends dedicated latency streams, one per direction, each at the
+ rate of 9 kpps at the prescribed packet size; these are sent in
+ addition to the main load streams.
+- TG reports min/avg/max latency values per stream direction, hence two
+ sets of latency values are reported per test case; future release of
+ TRex is expected to report latency percentiles.
+- Reported latency values are aggregate across two SUTs due to three
+ node topology used for all performance tests; for per SUT latency,
+ reported value should be divided by two.
+- 1usec is the measurement accuracy advertised by TRex TG for the setup
+ used in FD.io labs used by CSIT project.
+- TRex setup introduces an always-on error of about 2*2usec per latency
+ flow additonal Tx/Rx interface latency induced by TRex SW writing and
+ reading packet timestamps on CPU cores without HW acceleration on NICs
+ closer to the interface line.
--- /dev/null
+TRex Traffic Generator
+----------------------
+
+Usage
+~~~~~
+
+`TRex traffic generator <https://wiki.fd.io/view/TRex>`_ is used for all
+CSIT performance tests. TRex stateless mode is used to measure NDR and
+PDR throughputs using binary search (NDR and PDR discovery tests) and
+for quick checks of DUT performance against the reference NDRs (NDR
+check tests) for specific configuration.
+
+TRex is installed and run on the TG compute node. The typical procedure
+is:
+
+- If the TRex is not already installed on TG, it is installed in the
+ suite setup phase - see `TRex intallation`_.
+- TRex configuration is set in its configuration file
+ ::
+
+ /etc/trex_cfg.yaml
+
+- TRex is started in the background mode
+ ::
+
+ $ sh -c 'cd <t-rex-install-dir>/scripts/ && sudo nohup ./t-rex-64 -i -c 7 --iom 0 > /tmp/trex.log 2>&1 &' > /dev/null
+
+- There are traffic streams dynamically prepared for each test, based on traffic
+ profiles. The traffic is sent and the statistics obtained using
+ :command:`trex_stl_lib.api.STLClient`.
+
+Measuring Packet Loss
+~~~~~~~~~~~~~~~~~~~~~
+
+Following sequence is followed to measure packet loss:
+
+- Create an instance of STLClient.
+- Connect to the client.
+- Add all streams.
+- Clear statistics.
+- Send the traffic for defined time.
+- Get the statistics.
+
+If there is a warm-up phase required, the traffic is sent also before
+test and the statistics are ignored.
+
+Measuring Latency
+~~~~~~~~~~~~~~~~~
+
+If measurement of latency is requested, two more packet streams are
+created (one for each direction) with TRex flow_stats parameter set to
+STLFlowLatencyStats. In that case, returned statistics will also include
+min/avg/max latency values.
--- /dev/null
+Tunnel Encapsulations
+---------------------
+
+Tunnel encapsulations testing is grouped based on the type of outer
+header: IPv4 or IPv6.
+
+IPv4 Tunnels
+~~~~~~~~~~~~
+
+VPP is tested in the following IPv4 tunnel baseline configurations:
+
+- *ip4vxlan-l2bdbase*: VXLAN over IPv4 tunnels with L2 bridge-domain MAC
+ switching.
+- *ip4vxlan-l2xcbase*: VXLAN over IPv4 tunnels with L2 cross-connect.
+- *ip4lispip4-ip4base*: LISP over IPv4 tunnels with IPv4 routing.
+- *ip4lispip6-ip6base*: LISP over IPv4 tunnels with IPv6 routing.
+
+In all cases listed above low number of MAC, IPv4, IPv6 flows (253 per
+direction) is switched or routed by VPP.
+
+In addition selected IPv4 tunnels are tested at scale:
+
+- *dot1q--ip4vxlanscale-l2bd*: VXLAN over IPv4 tunnels with L2 bridge-
+ domain MAC switching, with scaled up dot1q VLANs (10, 100, 1k),
+ mapped to scaled up L2 bridge-domains (10, 100, 1k), that are in turn
+ mapped to (10, 100, 1k) VXLAN tunnels. 64.5k flows are transmitted per
+ direction.
+
+IPv6 Tunnels
+~~~~~~~~~~~~
+
+VPP is tested in the following IPv6 tunnel baseline configurations:
+
+- *ip6lispip4-ip4base*: LISP over IPv4 tunnels with IPv4 routing.
+- *ip6lispip6-ip6base*: LISP over IPv4 tunnels with IPv6 routing.
+
+In all cases listed above low number of IPv4, IPv6 flows (253 per
+direction) is routed by VPP.
--- /dev/null
+VPP_Device Functional
+---------------------
+
+|csit-release| added new VPP_Device test environment for functional VPP
+device tests integrated into LFN CI/CD infrastructure. VPP_Device tests
+run on 1-Node testbeds (1n-skx, 1n-arm) and rely on Linux SRIOV Virtual
+Function (VF), dot1q VLAN tagging and external loopback cables to
+facilitate packet passing over exernal physical links. Initial focus is
+on few baseline tests. Existing CSIT VIRL tests can be moved to
+VPP_Device framework by changing L1 and L2 KW(s). RF test definition
+code stays unchanged with the exception of requiring adjustments from
+3-Node to 2-Node logical topologies. CSIT VIRL to VPP_Device migration
+is expected in the next CSIT release.
--- /dev/null
+VPP Features
+------------
+
+VPP is tested in a number of data plane feature configurations across
+different forwarding modes. Following sections list features tested.
+
+ACL Security-Groups
+~~~~~~~~~~~~~~~~~~~
+
+Both stateless and stateful access control lists (ACL), also known as
+security-groups, are supported by VPP.
+
+Following ACL configurations are tested for MAC switching with L2
+bridge-domains:
+
+- *l2bdbasemaclrn-iacl{E}sl-{F}flows*: Input stateless ACL, with {E}
+ entries and {F} flows.
+- *l2bdbasemaclrn-oacl{E}sl-{F}flows*: Output stateless ACL, with {E}
+ entries and {F} flows.
+- *l2bdbasemaclrn-iacl{E}sf-{F}flows*: Input stateful ACL, with {E}
+ entries and {F} flows.
+- *l2bdbasemaclrn-oacl{E}sf-{F}flows*: Output stateful ACL, with {E}
+ entries and {F} flows.
+
+Following ACL configurations are tested with IPv4 routing:
+
+- *ip4base-iacl{E}sl-{F}flows*: Input stateless ACL, with {E} entries
+ and {F} flows.
+- *ip4base-oacl{E}sl-{F}flows*: Output stateless ACL, with {E} entries
+ and {F} flows.
+- *ip4base-iacl{E}sf-{F}flows*: Input stateful ACL, with {E} entries and
+ {F} flows.
+- *ip4base-oacl{E}sf-{F}flows*: Output stateful ACL, with {E} entries
+ and {F} flows.
+
+ACL tests are executed with the following combinations of ACL entries
+and number of flows:
+
+- ACL entry definitions
+
+ - flow non-matching deny entry: (src-ip4, dst-ip4, src-port, dst-port).
+ - flow matching permit ACL entry: (src-ip4, dst-ip4).
+
+- {E} - number of non-matching deny ACL entries, {E} = [1, 10, 50].
+- {F} - number of UDP flows with different tuple (src-ip4, dst-ip4,
+ src-port, dst-port), {F} = [100, 10k, 100k].
+- All {E}x{F} combinations are tested per ACL type, total of 9.
+
+ACL MAC-IP
+~~~~~~~~~~
+
+MAC-IP binding ACLs are tested for MAC switching with L2 bridge-domains:
+
+- *l2bdbasemaclrn-macip-iacl{E}sl-{F}flows*: Input stateless ACL, with
+ {E} entries and {F} flows.
+
+MAC-IP ACL tests are executed with the following combinations of ACL
+entries and number of flows:
+
+- ACL entry definitions
+
+ - flow non-matching deny entry: (dst-ip4, dst-mac, bit-mask)
+ - flow matching permit ACL entry: (dst-ip4, dst-mac, bit-mask)
+
+- {E} - number of non-matching deny ACL entries, {E} = [1, 10, 50]
+- {F} - number of UDP flows with different tuple (dst-ip4, dst-mac),
+ {F} = [100, 10k, 100k]
+- All {E}x{F} combinations are tested per ACL type, total of 9.
+
+NAT44
+~~~~~
+
+NAT44 is tested in baseline and scale configurations with IPv4 routing:
+
+- *ip4base-nat44*: baseline test with single NAT entry (addr, port),
+ single UDP flow.
+- *ip4base-udpsrcscale{U}-nat44*: baseline test with {U} NAT entries
+ (addr, {U}ports), {U}=15.
+- *ip4scale{R}-udpsrcscale{U}-nat44*: scale tests with {R}*{U} NAT
+ entries ({R}addr, {U}ports), {R}=[100, 1k, 2k, 4k], {U}=15.
--- /dev/null
+VPP Forwarding Modes
+--------------------
+
+VPP is tested in a number of L2 and IP packet lookup and forwarding
+modes. Within each mode baseline and scale tests are executed, the
+latter with varying number of lookup entries.
+
+L2 Ethernet Switching
+~~~~~~~~~~~~~~~~~~~~~
+
+VPP is tested in three L2 forwarding modes:
+
+- *l2patch*: L2 patch, the fastest point-to-point L2 path that loops
+ packets between two interfaces without any Ethernet frame checks or
+ lookups.
+- *l2xc*: L2 cross-connect, point-to-point L2 path with all Ethernet
+ frame checks, but no MAC learning and no MAC lookup.
+- *l2bd*: L2 bridge-domain, multipoint-to-multipoint L2 path with all
+ Ethernet frame checks, with MAC learning (unless static MACs are used)
+ and MAC lookup.
+
+l2bd tests are executed in baseline and scale configurations:
+
+- *l2bdbase*: low number of L2 flows (253 per direction) is switched by
+ VPP. They drive the content of MAC FIB size (506 total MAC entries).
+ Both source and destination MAC addresses are incremented on a packet
+ by packet basis.
+
+- *l2bdscale*: high number of L2 flows is switched by VPP. Tested MAC
+ FIB sizes include: i) 10k (5k unique flows per direction), ii) 100k
+ (2x 50k flows) and iii) 1M (2x 500k). Both source and destination MAC
+ addresses are incremented on a packet by packet basis, ensuring new
+ entries are learn refreshed and looked up at every packet, making it
+ the worst case scenario.
+
+Ethernet wire encapsulations tested include: untagged, dot1q, dot1ad.
+
+IPv4 Routing
+~~~~~~~~~~~~
+
+IPv4 routing tests are executed in baseline and scale configurations:
+
+- *ip4base*: low number of IPv4 flows (253 per direction) is routed by
+ VPP. They drive the content of IPv4 FIB size (506 total /32 prefixes).
+ Destination IPv4 addresses are incremented on a packet by packet
+ basis.
+
+- *ip4scale*: high number of IPv4 flows is routed by VPP. Tested IPv4
+ FIB sizes of /32 prefixes include: i) 20k (10k unique flows per
+ direction), ii) 200k (2x 100k flows) and iii) 2M (2x 1M). Destination
+ IPv4 addresses are incremented on a packet by packet basis, ensuring
+ new FIB entries are looked up at every packet, making it the worst
+ case scenario.
+
+IPv6 Routing
+~~~~~~~~~~~~
+
+IPv6 routing tests are executed in baseline and scale configurations:
+
+- *ip6base*: low number of IPv6 flows (253 per direction) is routed by
+ VPP. They drive the content of IPv6 FIB size (506 total /128 prefixes).
+ Destination IPv6 addresses are incremented on a packet by packet
+ basis.
+
+- *ip6scale*: high number of IPv6 flows is routed by VPP. Tested IPv6
+ FIB sizes of /128 prefixes include: i) 20k (10k unique flows per
+ direction), ii) 200k (2x 100k flows) and iii) 2M (2x 1M). Destination
+ IPv6 addresses are incremented on a packet by packet basis, ensuring
+ new FIB entries are looked up at every packet, making it the worst
+ case scenario.
+
+SRv6 Routing
+~~~~~~~~~~~~
+
+SRv6 routing tests are executed in a number of baseline configurations,
+in each case SR policy and steering policy are configured for one
+direction and one (or two) SR behaviours (functions) in the other
+directions:
+
+- *srv6enc1sid*: One SID (no SRH present), one SR function - End.
+- *srv6enc2sids*: Two SIDs (SRH present), two SR functions - End and
+ End.DX6.
+- *srv6enc2sids-nodecaps*: Two SIDs (SRH present) without decapsulation,
+ one SR function - End.
+- *srv6proxy-dyn*: Dynamic SRv6 proxy, one SR function - End.AD.
+- *srv6proxy-masq*: Masquerading SRv6 proxy, one SR function - End.AM.
+- *srv6proxy-stat*: Static SRv6 proxy, one SR function - End.AS.
+
+In all listed cases low number of IPv6 flows (253 per direction) is
+routed by VPP.
--- /dev/null
+VPP Startup Settings
+--------------------
+
+CSIT code manipulates a number of VPP settings in startup.conf for optimized
+performance. List of common settings applied to all tests and test
+dependent settings follows.
+
+See `VPP startup.conf`_
+for a complete set and description of listed settings.
+
+Common Settings
+~~~~~~~~~~~~~~~
+
+List of vpp startup.conf settings applied to all tests:
+
+#. heap-size <value> - set separately for ip4, ip6, stats, main
+ depending on scale tested.
+#. no-tx-checksum-offload - disables UDP / TCP TX checksum offload in DPDK.
+ Typically needed for use faster vector PMDs (together with
+ no-multi-seg).
+#. socket-mem <value>,<value> - memory per numa. (Not required anymore
+ due to VPP code changes, should be removed in CSIT-18.10.)
+
+Per Test Settings
+~~~~~~~~~~~~~~~~~
+
+List of vpp startup.conf settings applied dynamically per test:
+
+#. corelist-workers <list_of_cores> - list of logical cores to run VPP
+ worker data plane threads. Depends on HyperThreading and core per
+ test configuration.
+#. num-rx-queues <value> - depends on a number of VPP threads and NIC
+ interfaces.
+#. num-rx-desc/num-tx-desc - number of rx/tx descriptors for specific
+ NICs, incl. xl710, x710, xxv710.
+#. num-mbufs <value> - increases number of buffers allocated, needed
+ only in scenarios with large number of interfaces and worker threads.
+ Value is per CPU socket. Default is 16384.
+#. no-multi-seg - disables multi-segment buffers in DPDK, improves
+ packet throughput, but disables Jumbo MTU support. Disabled for all
+ tests apart from the ones that require Jumbo 9000B frame support.
+#. UIO driver - depends on topology file definition.
+#. QAT VFs - depends on NRThreads, each thread = 1QAT VFs.
--- /dev/null
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\ No newline at end of file
Furthermore it describes and summarizes implementation details of Integration
and System tests platform *1-Node VPP_Device*. It aims to provide a complete
end-to-end view of *1-Node VPP_Device* environment in order to improve
-extendibility and maintenance, under the guideline of VPP core team.
+extendability and maintenance, under the guideline of VPP core team.
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD",
"SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be
Overview
--------
-.. todo: Covert to SVG
+.. only:: latex
+
+ .. raw:: latex
-.. image:: vpp-device.png
+ \begin{figure}[H]
+ \centering
+ \graphicspath{{../_tmp/src/vpp_device_tests/}}
+ \includegraphics[width=0.90\textwidth]{vpp_device}
+ \label{fig:vpp_device}
+ \end{figure}
+
+.. only:: html
+
+ .. figure:: vpp_device.svg
+ :alt: vpp_device
+ :align: center
Physical Testbeds
-----------------
- **2-Container Topology**: Consisting of one Docker container acting as SUT
(System Under Test) and one Docker container as TG (Traffic Generator), both
- connected in ring topology via physical NIC crossconnecting.
+ connected in ring topology via physical NIC cross-connecting.
Current FD.io production testbeds are built with servers based on one
processor generation of Intel Xeons: Skylake (Platinum 8180). Testbeds built
- DPDK VF driver,
- Fortville AVF driver.
-Provided Intel x710-da4 4p10GE NICs suppport 32 VFs per interface, 128 per NIC.
+Provided Intel x710-da4 4p10GE NICs support 32 VFs per interface, 128 per NIC.
Complete 1n-skx testbeds specification is available on `CSIT LF Testbeds
<https://wiki.fd.io/view/CSIT/Testbeds:_Xeon_Skx,_Arm,_Atom.>`_ wiki page.
Versioning
~~~~~~~~~~
-As of initial version of vpp-device, we do have only single `:latest` version of
+As of initial version of vpp-device, we do have only single latest version of
Docker image hosted on [dockerhub]_. This will be addressed as further
improvement with proper semantic versioning.
--- /dev/null
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\ No newline at end of file
.. _FD.io DPDK compile job: https://jenkins.fd.io/view/deb-dpdk/job/deb_dpdk-merge-{sdpdkrelease}-ubuntu1604/
.. _CSIT Testbed Setup: https://git.fd.io/csit/tree/resources/tools/testbed-setup/README.md?h={release}
.. _K8s configuration files: https://github.com/FDio/csit/tree/{release}/resources/templates/kubernetes
+.. _VPP startup.conf: https://git.fd.io/vpp/tree/src/vpp/conf/startup.conf?h=stable/{srelease}
""".format(release='rls1901',
report_week=report_week,
prev_release='rls1810',
Code Review / csit.git / commitdiff
