From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5DBA446BF; Fri, 17 Jan 2025 11:21:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737112890; cv=none; b=VKfKBlugiNBE7xoZrmOBsNri1N4vqUPjYgNLjroQkDRkRtZAMi2UZrwWXo12ZCdHYz91oscXzc0nBzSYr3nrPPnmubkppZ+yGs0RxiQyiax0Ui8n9NFSG9JqWwaksuXpZsdfZDiwJRveYy6e2n8ES72mlUlN2pE6y5KvcmKR6O0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737112890; c=relaxed/simple; bh=Co1DCFjxxhpAid1mrlCPz2pqOzEgHOBfgr4SL6G6rZs=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=cs6pxyGcIuaQb9y+cZRpikSM0P9SmCx0BBxR7TMtV0SPfb2npodNy5sygOZlNdZs9U5kl7AufIDp21XQlvzDgTIAtN1ihUgQSXRlDSqjoYercxwF1NiJvvYq4rWe9RA/UwLz3ycOYZOWFjMJLH9Mn+NOkAWbmwgS64MEM0eHJHM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=V6yL5boe; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="V6yL5boe" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C0E9AC4CEDD; Fri, 17 Jan 2025 11:21:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1737112890; bh=Co1DCFjxxhpAid1mrlCPz2pqOzEgHOBfgr4SL6G6rZs=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=V6yL5boevwWP7qcydTLn7xbocKRIlTz/tBZU8fDeETvQj9XFWELK2TM/r06PMFxTz peenXRgNt1Gj1HMZNmE0g5kq7S0PQnARHTnPKD1YtP+TR9wHWFSbXSsd9w6P/r0dn+ PeVAn5OXAgN0DxszVFfLXlZ0htyRVYmKnuqxiV3K9zfwq/yPvaEl+OGjPns2CBtyDV BxE2TODtT47gNJalCjjnbvkfiBKk/+ZVYSURQy3/sxAoHDc5eGqPAoKd/gtYQYl8iW jPaDxNkQIWB3QajZk5QhwAD5ZDxM1NVU3HAah6Kui/5pfRkg46S2UReLMVIPn1Y6jn JKtjYwy/KLQUw== Message-ID: <16f25267-059c-4792-9928-a868ac3ee309@kernel.org> Date: Fri, 17 Jan 2025 12:21:17 +0100 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Beta Subject: Re: [PATCH net-next] selftests/net: packetdrill: make tcp buf limited timing tests benign Content-Language: en-GB To: Willem de Bruijn , Jakub Kicinski Cc: netdev@vger.kernel.org, edumazet@google.com, pabeni@redhat.com, andrew+netdev@lunn.ch, horms@kernel.org, shuah@kernel.org, willemb@google.com, linux-kselftest@vger.kernel.org, davem@davemloft.net References: <20250115232129.845884-1-kuba@kernel.org> <678904353ca7e_3710bc294ef@willemb.c.googlers.com.notmuch> From: Matthieu Baerts Autocrypt: addr=matttbe@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit Hi Willem, Jakub, On 16/01/2025 14:05, Willem de Bruijn wrote: > Jakub Kicinski wrote: >> The following tests are failing on debug kernels: >> >> tcp_tcp_info_tcp-info-rwnd-limited.pkt >> tcp_tcp_info_tcp-info-sndbuf-limited.pkt (...) > We'll take a look after this change whether we can make these > more resilient. But likely also allow-list or even xfail for > everything in dbg. On MPTCP side, I spent quite a bit of time trying to improve the situation on debug kernels. Sure it feels good and reassuring to have spent this time understanding the instabilities. Most issues were due to spurious retransmissions, because Packetdrill was "too slow" to inject replies: so more like an issue in the tests. But I don't know if having these tests running in such slow environments helped to find bugs directly, e.g. catching unexpected packets. Maybe once? But at what cost? Still it is good to run them on debug kernels to have extra verifications on the kernel side. As Ido mentioned last summer, perhaps we can ignore the test results, but keep logging them, and only look at the kernel warnings? So yes, I agree with Willem: if that cannot easily be fixed, ignoring packetdrill err code for everything in debug sounds like the right direction. Cheers, Matt -- Sponsored by the NGI0 Core fund.