[PATCH net v2 3/4] selftests: net: Lower threshold with csum offload off in big_tcp_tunnels.sh
From: Alice Mikityanska <hidden>
Date: 2026-08-22 12:03:35
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>
With checksum offload disabled, much fewer BIG TCP packets are generated
due to overall loss of throughput. Use a separate threshold in these
tests, which is 1/10 of the threshold set for the rest of tests.
Fixes: 5cb53743e1ff ("selftests: net: Add a test for BIG TCP in UDP tunnels")
Signed-off-by: Alice Mikityanska <redacted>
---
tools/testing/selftests/net/big_tcp_tunnels.sh | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/tools/testing/selftests/net/big_tcp_tunnels.sh b/tools/testing/selftests/net/big_tcp_tunnels.sh
index e0b41f394ebb..003878df7415 100755
--- a/tools/testing/selftests/net/big_tcp_tunnels.sh
+++ b/tools/testing/selftests/net/big_tcp_tunnels.sh@@ -107,6 +107,8 @@ cleanup() { } do_test() { + local packets_threshold="$PACKETS_THRESHOLD" + # When tx csum offload is off, software GSO is performed before passing the # packet to veth. Check BIG TCP packets inside the VXLAN tunnel to verify # the software checksum path: if the checksum code is broken, these packets
@@ -125,6 +127,7 @@ do_test() { else IPTABLES=ip6tables fi + packets_threshold=$(( PACKETS_THRESHOLD / 10 )) fi if [ "$2" = 4 ]; then IPTABLES_SACK=iptables
@@ -157,8 +160,8 @@ do_test() { echo "Captured BIG TCP RX packets: $PACKETS_SERVER" echo "Captured BIG TCP TX packets: $PACKETS_CLIENT" echo "Captured TCP SACK packets: $PACKETS_SACK" - [ "$PACKETS_SERVER" -gt "$PACKETS_THRESHOLD" ] || return 1 - [ "$PACKETS_CLIENT" -gt "$PACKETS_THRESHOLD" ] || return 1 + [ "$PACKETS_SERVER" -gt "$packets_threshold" ] || return 1 + [ "$PACKETS_CLIENT" -gt "$packets_threshold" ] || return 1 [ "$PACKETS_SACK" -lt "$(( PACKETS_CLIENT / 2 ))" ] || return 1 }
--
2.55.0