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selftests/net: relax cpu affinity requirement in msg_zerocopy test

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[ Upstream commit 16f6458f24 ]

The msg_zerocopy test pins the sender and receiver threads to separate
cores to reduce variance between runs.

But it hardcodes the cores and skips core 0, so it fails on machines
with the selected cores offline, or simply fewer cores.

The test mainly gives code coverage in automated runs. The throughput
of zerocopy ('-z') and non-zerocopy runs is logged for manual
inspection.

Continue even when sched_setaffinity fails. Just log to warn anyone
interpreting the data.

Fixes: 07b65c5b31 ("test: add msg_zerocopy test")
Reported-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Acked-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Willem de Bruijn 2020-08-05 04:40:45 -04:00 committed by Greg Kroah-Hartman
parent b8f2d34f6b
commit 848e15a8c8
1 changed files with 2 additions and 3 deletions
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5
tools/testing/selftests/net/msg_zerocopy.c
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@ -125,9 +125,8 @@ static int do_setcpu(int cpu)
CPU_ZERO(&mask);
CPU_SET(cpu, &mask);
if (sched_setaffinity(0, sizeof(mask), &mask))
error(1, 0, "setaffinity %d", cpu);
if (cfg_verbose)
fprintf(stderr, "cpu: unable to pin, may increase variance.\n");
else if (cfg_verbose)
fprintf(stderr, "cpu: %u\n", cpu);
return 0;