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 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
