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 558621A01C6; Fri, 1 Aug 2025 21:05:58 +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=1754082358; cv=none; b=lK6QTDwp2Yhda9n3gRRvoKaOfeM76Llc2B3JJQiVdV0+W+90alAb6wgD1zckNccs65AN4SNmgHxLNrDsk6Q2r9vRlYB6qoo+oXleLJVLlCVS2+qPdIwaS4LX59N19L706FRfF/uTqysD399eSun9DgmqX9ezDdFWf2WKW5fnqyk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754082358; c=relaxed/simple; bh=WoLvDfKHC8rXAhX8dU4W9WkDcw3sCXY0/sQU2CyY7GM=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=TWNxz4299GnvCNVTp2YPUS2A+N6/8Mlej11fTpE2LUFZZKorbSt9vnExlq4+MqFDFjqfEs8ARkx942yL4EY8Psr3qUlGsnLmAfs5PFRiX6RlV3bGePK3xxj6xHt93TFW5VVq9rPE57OzUV3bnfjMjyoeqZll0DL+cmJVVU6xlEg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=U0sGwPvU; 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="U0sGwPvU" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DA64FC4CEE7; Fri, 1 Aug 2025 21:05:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1754082358; bh=WoLvDfKHC8rXAhX8dU4W9WkDcw3sCXY0/sQU2CyY7GM=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=U0sGwPvUhv7vaKp+HEe7l/OhtPY7xcQMPzzJyYcTDBdPgCu4dPut+8xWTFegSxO1C tGbn+B+Ku0qxJTK8CGHCPkbL5B1TH9v8LI3UXqP4IHzCvw7B9IAwk7kwVEaSucWyNn YayDUJNAJRoPgyHl7E4/1NTdyDAI6AnXY/zUnbWmfZZpYI5opT36WuKeRoaqTeQqJL DsPqeWS8ahqoWUpb3HwFTA6f11a8SwiXImm0Ey5jMmEMJp5eS2Ou+Iv2xIHvG9dEa5 73QaDOKf8meRxcgdOPduKqAtY1JYWsqZKL+8idSkvt6CD/uwkE+FTICEW0rqSsjv8B Ud1VRZsDQtZ3A== Date: Fri, 1 Aug 2025 14:05:57 -0700 From: Jakub Kicinski To: Willem de Bruijn Cc: davem@davemloft.net, netdev@vger.kernel.org, edumazet@google.com, pabeni@redhat.com, andrew+netdev@lunn.ch, horms@kernel.org, shuah@kernel.org, willemb@google.com, matttbe@kernel.org, linux-kselftest@vger.kernel.org Subject: Re: [PATCH net] selftests: net: packetdrill: xfail all problems on slow machines Message-ID: <20250801140557.53a36012@kernel.org> In-Reply-To: <688d2af39aff_2e1a6829416@willemb.c.googlers.com.notmuch> References: <20250801181638.2483531-1-kuba@kernel.org> <688d2af39aff_2e1a6829416@willemb.c.googlers.com.notmuch> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Fri, 01 Aug 2025 17:00:35 -0400 Willem de Bruijn wrote: > Jakub Kicinski wrote: > > We keep seeing flakes on packetdrill on debug kernels, while > > non-debug kernels are stable, not a single flake in 200 runs. > > Time to give up, debug kernels appear to suffer from 10msec > > latency spikes and any timing-sensitive test is bound to flake. > > > > Signed-off-by: Jakub Kicinski > > Reviewed-by: Willem de Bruijn I should have added "Willem was right" 'cause you suggested this a while back. But didn't know how to phrase it in the commit msg :)