[PATCH net v2 2/4] selftests: net: Lower threshold on debug kernels for big_tcp_tunnels.sh

[Alice Mikityanska <alice.kernel@fastmail.im>]

From: Alice Mikityanska <alice@isovalent.com>

Debug kernels on upstream CI runners run slower and generate fewer BIG
TCP packets, making the test flaky on upstream CI runners. Lower the
default threshold for those kernels.

Fixes: 5cb53743e1ff ("selftests: net: Add a test for BIG TCP in UDP tunnels")
Signed-off-by: Alice Mikityanska <alice@isovalent.com>
---
 tools/testing/selftests/net/big_tcp_tunnels.sh | 11 +++++++++--
 1 file changed, 9 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..e0b41f394ebb 100755
--- a/tools/testing/selftests/net/big_tcp_tunnels.sh
+++ b/tools/testing/selftests/net/big_tcp_tunnels.sh
@@ -17,11 +17,18 @@ 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
 
+if [ -z "$PACKETS_THRESHOLD" ]; then
+	if [ "$KSFT_MACHINE_SLOW" = yes ]; 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