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([2a0d:3344:5521:6b10:58fd:68f:7756:389d]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-47fc88d6e5bsm4070850f8f.3.2026.07.30.00.46.01 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 30 Jul 2026 00:46:02 -0700 (PDT) Message-ID: <606acc01-e22d-4e69-ad26-a8afff262b98@redhat.com> Date: Thu, 30 Jul 2026 09:46:01 +0200 Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net-next] selftests: net: Add a missing config option To: Alice Mikityanska , Matthieu Baerts Cc: Alice Mikityanska , Jakub Kicinski , Eric Dumazet , "David S. Miller" , Simon Horman , Shuah Khan , netdev@vger.kernel.org, linux-kselftest@vger.kernel.org References: <20260723140241.132120-1-alice.kernel@fastmail.im> <47b580de-9d11-46c9-91c5-55eb13c00bc4@kernel.org> Content-Language: en-US From: Paolo Abeni In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 7/29/26 10:44 PM, Alice Mikityanska wrote: > On Mon, 27 Jul 2026 at 12:09, Matthieu Baerts wrote: >> On 23/07/2026 16:02, Alice Mikityanska wrote: >>> From: Alice Mikityanska >>> >>> Commit 5cb53743e1ff ("selftests: net: Add a test for BIG TCP in UDP >>> tunnels") used iptables match comment, which was missed from the CI >>> kernel config. Add the missing config option. >> >> It helps, the CI can now run this test! >> >> Reviewed-by: Matthieu Baerts >> >> >> But I think another follow-up patch is required, because this test is >> flaky when using a debug kernel config: >> >> >> https://netdev.bots.linux.dev/flakes.html?min-flip=0&tn-needle=big-tcp-tunnels-sh >> >> Maybe because wait_local_port_listen() is required after having called >> netserver? > > The issue is hard to reproduce on my machine, but I could reproduce it > in ~12 hours of non-stop testing in a loop. It reproduces even with > wait_local_port_listen, so it must be something else. The log above > (and my repro attempts) shows that it fails in a non-first test, but > netserver starts only once, before the first test. If the failure was > due to netserver not being ready, it would fail in the first test. > I'll keep investigating. I *think* this kind of flakes are sort of expected for 'performance' related tests when running on debug kernel: the environment can be painful slow, and few failed iterations I saw has csum offload disabled - even lower expected tput. AFAICS the target packet number is independent from KSFT_MACHINE_SLOW and the actual offload setting. Possibly you can tune the target value a bit WRT the mentioned variables or skip entirely pkts number validation in the slowest permutation (note that the self-test will still have some value due to code coverage with sanitizers enabled). /p