[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20220708171413.327112-3-mathew.j.martineau@linux.intel.com>
Date: Fri, 8 Jul 2022 10:14:09 -0700
From: Mat Martineau <mathew.j.martineau@...ux.intel.com>
To: netdev@...r.kernel.org
Cc: Paolo Abeni <pabeni@...hat.com>, davem@...emloft.net,
kuba@...nel.org, edumazet@...gle.com, matthieu.baerts@...sares.net,
mptcp@...ts.linux.dev,
Mat Martineau <mathew.j.martineau@...ux.intel.com>
Subject: [PATCH net-next 2/6] selftests: mptcp: tweak simult_flows for debug kernels
From: Paolo Abeni <pabeni@...hat.com>
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@...hat.com>
Co-developed-by: Mat Martineau <mathew.j.martineau@...ux.intel.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@...ux.intel.com>
---
tools/testing/selftests/net/mptcp/simult_flows.sh | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/net/mptcp/simult_flows.sh b/tools/testing/selftests/net/mptcp/simult_flows.sh
index f441ff7904fc..ffa13a957a36 100755
--- a/tools/testing/selftests/net/mptcp/simult_flows.sh
+++ b/tools/testing/selftests/net/mptcp/simult_flows.sh
@@ -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
--
2.37.0
Powered by blists - more mailing lists