selftests/bpf: Fix expired UDP LRU entries in XDP LB benchmark

Browse source

populate_lru() zero-initializes atime:

    struct real_pos_lru lru = { .pos = real_idx };

connection_table_lookup() treats UDP entries with
cur_time - atime > 30s as expired, so every pre-populated entry
expires immediately.  Calibration masks this on the CPU it runs on,
but if validation migrates to another CPU:

    [udp-v4-lru-hit] COUNTER FAIL: LRU misses=1, expected 0

Initialize atime from CLOCK_MONOTONIC for UDP flows.

Fixes: a4b5ba8187 ("selftests/bpf: Add XDP load-balancer benchmark driver")
Signed-off-by: Puranjay Mohan <puranjay@kernel.org>
Link: https://lore.kernel.org/r/20260520133338.3392667-3-puranjay@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

...

This commit is contained in:

Puranjay Mohan 2026-05-20 06:33:31 -07:00 • committed by Alexei Starovoitov

parent fa747e9f84

commit 12e896b979

1 changed files with 11 additions and 0 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

11

tools/testing/selftests/bpf/benchs/bench_xdp_lb.c

View file