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diff --git a/docs/report/introduction/methodology_bmrr_throughput.rst b/docs/report/introduction/methodology_bmrr_throughput.rst new file mode 100644 index 0000000000..ac3c54e907 --- /dev/null +++ b/docs/report/introduction/methodology_bmrr_throughput.rst @@ -0,0 +1,54 @@ +(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. |