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 5ADA61EB9E1 for ; Wed, 7 Jan 2026 19:05:23 +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=1767812724; cv=none; b=tXX1in5u6I0RydOWylu+Qx1UJs14PZFIUwl2pZroqbpWIWDU+5cfFF2RJBnPgWG3xLHKTXwMPuXuBq5M79aeaKe46D+sDPsK3twgup6qZFjqmwsJO5Nyt4jH849lyLfmV5FfebQ3XPUmBYkuKlmF6krjlCPRnbYsGcBYyyAPnqs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767812724; c=relaxed/simple; bh=fqIIKDF1SzhUdqOs6bcNenM5vD3ZDIbqoK+ryPILNsw=; h=Date:From:To:Subject:Message-ID:MIME-Version:Content-Type; b=Emh1i9jfOk09ntykhDrEEtCdOGHfTezgv2Bcr/cBdvKBQOPtiQFA6uaW2yND6S7ZWuMbx4NWhE3QJMFiB58ggOtrdTwt/ke6d3YqvPLpDg1s8zzUk9YV8CTL7RfNlPHyDONScrIrCJ3sYJLer/3tpkabHa/93bhDdP9bhzdSqdM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=gsTuXvjj; 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="gsTuXvjj" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C8BEBC4CEF1; Wed, 7 Jan 2026 19:05:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1767812722; bh=fqIIKDF1SzhUdqOs6bcNenM5vD3ZDIbqoK+ryPILNsw=; h=Date:From:To:Subject:From; b=gsTuXvjjlENRJ8zSucdOndBB7rMuBnsHgIiyElzXh+/NqxZXXU+7Sej0OcGfaPoe2 iTxqCXx0hoeHJHzY3gz8u7sVW9wsmIZ9a6dAm0l4MAO94wjQUZywyMhZoxOsoBpnmC 3u2c/NVY9zUcgJGQcFjZeGjjlz9D74tDShmJswDpH7ozzVd4Sy1rmsYz6zRkxxdYFx u3pMyxpvp5epWV37JcaETdYDK4pOCt+Rvapbpq6Wu0sSk6vpUoT+HiViW1OxpRtEDP 3+v5DbtflZ7KpbNSoCS4v7+BI+o88rBo9Yikew4K4D762dwWbSW0VHyetbjA8BacFQ 58OTMbT0Fi4ng== Date: Wed, 7 Jan 2026 11:05:21 -0800 From: Jakub Kicinski To: Willem de Bruijn , "netdev@vger.kernel.org" Subject: [TEST] txtimestamp.sh pains after netdev foundation migration Message-ID: <20260107110521.1aab55e9@kernel.org> 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 Hi Willem! We discussed instability of txtimestamp.sh in the past but it has gotten even worse after we migrated from AWS to netdev foundation machines. Possibly because it's different HW. Possibly because we now run much newer kernels (AWS Linux vs Fedora). The test flakes a lot (we're talking about non-debug builds): https://netdev.bots.linux.dev/contest.html?test=txtimestamp-sh I tried a few things. The VM threads (vCPU, not IO) are now all pinned to dedicated CPUs. I added this patch to avoid long idle periods: https://github.com/linux-netdev/testing/commit/d468f582c617adece2a576788746a09d91e91574 These both help a little bit, but w still get 10+ flakes a week. I believe you have access to netdev foundation machines so feel free to poke if you have cycles..