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selftests: mptcp: tweak simult_flows for debug kernels 

The mentioned test measures the transfer run-time to verify
that the user-space program is able to use the full aggregate B/W.

Even on (virtual) link-speed-bound tests, debug kernel can slow
down the transfer enough to cause sporadic test failures.

Instead of unconditionally raising the maximum allowed run-time,
tweak when the running kernel is a debug one, and use some simple/
rough heuristic to guess such scenarios.

Note: this intentionally avoids looking for /boot/config-<version> as
the latter file is not always available in our reference CI
environments.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Co-developed-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2022-07-08 10:14:09 -07:00 committed by David S. Miller
parent f7657ff4a7
commit d0d9c8f2df
1 changed files with 13 additions and 1 deletions
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14
tools/testing/selftests/net/mptcp/simult_flows.sh
View File

@ -12,6 +12,7 @@ timeout_test=$((timeout_poll * 2 + 1))
test_cnt=1
ret=0
bail=0
slack=50
usage() {
echo "Usage: $0 [ -b ] [ -c ] [ -d ]"
@ -52,6 +53,7 @@ setup()
cout=$(mktemp)
capout=$(mktemp)
size=$((2 * 2048 * 4096))
dd if=/dev/zero of=$small bs=4096 count=20 >/dev/null 2>&1
dd if=/dev/zero of=$large bs=4096 count=$((size / 4096)) >/dev/null 2>&1
@ -104,6 +106,16 @@ setup()
ip -net "$ns3" route add default via dead:beef:3::2
ip netns exec "$ns3" ./pm_nl_ctl limits 1 1
# debug build can slow down measurably the test program
# we use quite tight time limit on the run-time, to ensure
# maximum B/W usage.
# Use kmemleak/lockdep/kasan/prove_locking presence as a rough
# estimate for this being a debug kernel and increase the
# maximum run-time accordingly. Observed run times for CI builds
# running selftests, including kbuild, were used to determine the
# amount of time to add.
grep -q ' kmemleak_init$\| lockdep_init$\| kasan_init$\| prove_locking$' /proc/kallsyms && slack=$((slack+550))
}
# $1: ns, $2: port
@ -241,7 +253,7 @@ run_test()
# mptcp_connect will do some sleeps to allow the mp_join handshake
# completion (see mptcp_connect): 200ms on each side, add some slack
time=$((time + 450))
time=$((time + 400 + slack))
printf "%-60s" "$msg"
do_transfer $small $large $time