On 18/06/2024 18:28, 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.
Hi,
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
I repeated the experiments multiple times and consistently obtained
similar results.
Are you aware of any performance regressions in recent kernel versions
that could explain these results?
[1] https://github.com/xdp-project/xdp-tools
Thanks for your report.
I assume cpu util for the active core on the DUT is 100% in all cases,
right?
Can you please share some more details? Like relevant ethtool counters,
and perf top output.
We'll check if this repro for us as well.
