Jesper Dangaard Brouer <hawk@xxxxxxxxxx> writes: > On 18/06/2024 17.28, Sebastiano Miano wrote: >> Hi folks, >> >> I have been conducting some basic experiments with XDP and have >> observed a significant performance regression in recent kernel >> versions compared to v5.15. >> >> My setup is the following: >> - Hardware: Two machines connected back-to-back with 100G Mellanox >> ConnectX-6 Dx. >> - DUT: 2x16 core Intel(R) Xeon(R) Silver 4314 CPU @ 2.40GHz. >> - Software: xdp-bench program from [1] running on the DUT in both DROP >> and TX modes. >> - Traffic generator: Pktgen-DPDK sending traffic with a single 64B UDP >> flow at ~130Mpps. >> - Tests: Single core, HT disabled >> >> Results: >> >> Kernel version |-------| XDP_DROP |--------| XDP_TX | >> 5.15 30Mpps 16.1Mpps >> 6.2 21.3Mpps 14.1Mpps >> 6.5 19.9Mpps 8.6Mpps >> bpf-next (6.10-rc2) 22.1Mpps 9.2Mpps >> > > Around when I left Red Hat there were a project with [LNST] that used > xdp-bench for tracking and finding regressions like this. > > Perhaps Toke can enlighten us, if that project have caught similar > regressions? > > [LNST] https://github.com/LNST-project/lnst Yes, actually, we have! Here's the bugzilla for it: https://bugzilla.redhat.com/show_bug.cgi?id=2270408 I'm on PTO for the rest of this week, but adding Samuel who ran the tests to Cc, he should be able to provide more information if needed. -Toke
