[PATCH net-next 2/4] selftests: net: Lower threshold on debug kernels for big_tcp_tunnels.sh
From: Alice Mikityanska <hidden>
Date: 2026-08-14 19:42:26
Also in:
linux-kselftest
Subsystem:
kernel selftest framework, networking [general], the rest · Maintainers:
Shuah Khan, Shuah Khan, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
From: Alice Mikityanska <redacted> CONFIG_DEBUG_NET kernels run slower and generate fewer BIG TCP packets, making the test flaky on upstream CI runners. Lower the default threshold for those kernels. Signed-off-by: Alice Mikityanska <redacted> --- tools/testing/selftests/net/big_tcp_tunnels.sh | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-)
diff --git a/tools/testing/selftests/net/big_tcp_tunnels.sh b/tools/testing/selftests/net/big_tcp_tunnels.sh
index 9b7d0456bcc1..e27774eae20e 100755
--- a/tools/testing/selftests/net/big_tcp_tunnels.sh
+++ b/tools/testing/selftests/net/big_tcp_tunnels.sh@@ -17,11 +17,25 @@ CLIENT_IP6="2001:db8::1:2" CLIENT_IP4_TUN="192.168.2.2" CLIENT_IP6_TUN="2001:db8::2:2" -: "${PACKETS_THRESHOLD:=1000}" - # Kselftest framework requirement - SKIP code is 4. ksft_skip=4 +is_debug() { + local config="/proc/config.gz" + [ -f "$config" ] || config="/boot/config-$(uname -r)" + [ -f "$config" ] || return 1 # No config found; assume non-debug. + gzip -dcfq "$config" | grep -qx 'CONFIG_DEBUG_NET=y' || return 1 +} + +if [ -z "$PACKETS_THRESHOLD" ]; then + if is_debug; then + echo 'Debug kernel detected, lowering the default threshold' + PACKETS_THRESHOLD=100 + else + PACKETS_THRESHOLD=1000 + fi +fi + setup() { ip netns add "$SERVER_NS" ip netns add "$CLIENT_NS"
--
2.55.0