Re: [PATCH bpf v2 2/2] selftests/bpf: add perf test for adjust_{head,meta}

On Mon, 31 Mar 2025 11:23:45 +0800 Jiayuan Chen wrote:

which is negligible for the net stack.

Before memset ./test_progs -a xdp_adjust_head_perf -v run adjust head with size 6 cost 56 ns run adjust head with size 20 cost 56 ns run adjust head with size 40 cost 56 ns run adjust head with size 200 cost 56 ns

After memset ./test_progs -a xdp_adjust_head_perf -v run adjust head with size 6 cost 58 ns run adjust head with size 20 cost 58 ns run adjust head with size 40 cost 58 ns run adjust head with size 200 cost 66 ns

FWIW I'm not sure if this is "negligible" for XDP like you say, but I defer to Jesper :)