report: edits of methodology throughput sections

[csit.git] / docs / report / introduction / methodology_bmrr_throughput.rst

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-(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, 25GE 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.