Overview
========
-Tested Topologies HW
---------------------
+Tested Physical Topologies
+--------------------------
CSIT Testpmd performance tests are executed on physical baremetal servers hosted
by LF FD.io project. Testbed physical topology is shown in the figure below.
Detailed LF FD.io test bed specification and topology is described in
`wiki CSIT LF testbed <https://wiki.fd.io/view/CSIT/CSIT_LF_testbed>`_.
-Testing Summary
----------------
+Performance Tests Coverage
+--------------------------
Performance tests are split into the two main categories:
testbed resources to grow, and will be adding complete set of performance
tests for all models of hardware to be executed regularly and(or)
continuously.
+
+Methodology: Multi-Thread and Multi-Core
+----------------------------------------
+
+**HyperThreading** - CSIT |release| performance tests are executed with SUT
+servers' Intel XEON CPUs configured in HyperThreading Disabled mode (BIOS
+settings). This is the simplest configuration used to establish baseline
+single-thread single-core SW packet processing and forwarding performance.
+Subsequent releases of CSIT will add performance tests with Intel
+HyperThreading Enabled (requires BIOS settings change and hard reboot).
+
+**Multi-core Test** - CSIT |release| multi-core tests are executed in the
+following Testpmd thread and core configurations:
+
+#. 1t1c - 1 Testpmd pmd thread on 1 CPU physical core.
+#. 2t2c - 2 Testpmd pmd threads on 2 CPU physical cores.
+#. 4t4c - 4 Testpmd pmd threads on 4 CPU physical cores.
+
+Note that in many tests running Testpmd reaches tested NIC I/O bandwidth
+or packets-per-second limit.
+
+Methodology: Packet Throughput
+------------------------------
+
+Following values are measured and reported for packet throughput tests:
+
+- NDR binary search per RFC2544:
+
+ - Packet rate: "RATE: <aggregate packet rate in packets-per-second> pps
+ (2x <per direction packets-per-second>)"
+ - Aggregate bandwidth: "BANDWIDTH: <aggregate bandwidth in Gigabits per
+ second> Gbps (untagged)"
+
+- PDR binary search per RFC2544:
+
+ - Packet rate: "RATE: <aggregate packet rate in packets-per-second> pps (2x
+ <per direction packets-per-second>)"
+ - Aggregate bandwidth: "BANDWIDTH: <aggregate bandwidth in Gigabits per
+ second> Gbps (untagged)"
+ - Packet loss tolerance: "LOSS_ACCEPTANCE <accepted percentage of packets
+ lost at PDR rate>""
+
+- NDR and PDR are measured for the following L2 frame sizes:
+
+ - IPv4: 64B, 1518B, 9000B.
+
+
+Methodology: Packet Latency
+---------------------------
+
+TRex Traffic Generator (TG) is used for measuring latency of Testpmd DUTs.
+Reported latency values are measured using following methodology:
+
+- Latency tests are performed at 10%, 50% of discovered NDR rate (non drop rate)
+ for each NDR throughput test and packet size (except IMIX).
+- TG sends dedicated latency streams, one per direction, each at the rate of
+ 10kpps 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.
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