When running the simult_flow selftest in slow environments -- e.g. QEmu without KVM support --, the results can be unstable. This selftest checks if the aggregated bandwidth is (almost) fully used as expected.

To help improving the stability while still keeping the same validation in place, the BW and the delay are reduced to lower the pressure on the CPU.

Fixes: 1a418cb8e888 ("mptcp: simult flow self-tests") Fixes: 219d04992b68 ("mptcp: push pending frames when subflow has free space") Cc: stable@vger.kernel.org Suggested-by: Paolo Abeni pabeni@redhat.com Signed-off-by: Matthieu Baerts (NGI0) matttbe@kernel.org Link: https://lore.kernel.org/r/20240131-upstream-net-20240131-mptcp-ci-issues-v1-... Signed-off-by: Jakub Kicinski kuba@kernel.org (cherry picked from commit 5e2f3c65af47e527ccac54060cf909e3306652ff) Signed-off-by: Matthieu Baerts (NGI0) matttbe@kernel.org --- Notes: - Conflicts in simult_flows.sh, because v5.15 doesn't have commit 675d99338e7a ("selftests: mptcp: simult flows: format subtests results in TAP") which modifies the context for a new but unrelated feature. - This is a new version to the one recently proposed by Sasha, this time without dependences: https://lore.kernel.org/stable/9f185a3f-9373-401c-9a5c-ec0f106c0cbc@kernel.o... - This is the same patch as the one recently sent for v6.1: https://lore.kernel.org/stable/20240311111224.1421344-2-matttbe@kernel.org/ --- tools/testing/selftests/net/mptcp/simult_flows.sh | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/tools/testing/selftests/net/mptcp/simult_flows.sh b/tools/testing/selftests/net/mptcp/simult_flows.sh index 752cef168804..cab3e3a5481d 100755 --- a/tools/testing/selftests/net/mptcp/simult_flows.sh +++ b/tools/testing/selftests/net/mptcp/simult_flows.sh @@ -289,10 +289,11 @@ done

setup run_test 10 10 0 0 "balanced bwidth" -run_test 10 10 1 50 "balanced bwidth with unbalanced delay" +run_test 10 10 1 25 "balanced bwidth with unbalanced delay"

# we still need some additional infrastructure to pass the following test-cases -run_test 30 10 0 0 "unbalanced bwidth" -run_test 30 10 1 50 "unbalanced bwidth with unbalanced delay" -run_test 30 10 50 1 "unbalanced bwidth with opposed, unbalanced delay" +run_test 10 3 0 0 "unbalanced bwidth" +run_test 10 3 1 25 "unbalanced bwidth with unbalanced delay" +run_test 10 3 25 1 "unbalanced bwidth with opposed, unbalanced delay" + exit $ret