From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from wp530.webpack.hosteurope.de (wp530.webpack.hosteurope.de [80.237.130.52]) (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 C599438F for ; Thu, 8 Sep 2022 16:50:18 +0000 (UTC) Received: from [2a02:8108:963f:de38:eca4:7d19:f9a2:22c5]; authenticated by wp530.webpack.hosteurope.de running ExIM with esmtpsa (TLS1.3:ECDHE_RSA_AES_128_GCM_SHA256:128) id 1oWKjB-0001DD-O4; Thu, 08 Sep 2022 18:50:09 +0200 Message-ID: <83d087ac-e69c-f57e-4486-f58bc6da5c52@leemhuis.info> Date: Thu, 8 Sep 2022 18:50:09 +0200 Precedence: bulk X-Mailing-List: regressions@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.2.1 Content-Language: en-US, de-DE To: "regressions@lists.linux.dev" References: From: Thorsten Leemhuis Subject: Re: d4252071b9: fxmark.ssd_ext4_no_jnl_DWTL_54_directio.works/sec -26.5% regression #forregzbot In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-bounce-key: webpack.hosteurope.de;regressions@leemhuis.info;1662655818;3c1cd0ac; X-HE-SMSGID: 1oWKjB-0001DD-O4 TWIMC: this mail is primarily send for documentation purposes and for regzbot, my Linux kernel regression tracking bot. These mails usually contain '#forregzbot' in the subject, to make them easy to spot and filter. On 31.08.22 09:21, kernel test robot wrote: > > hi, pleased be noted that we read this patch and understand it as a fix, > also what we understand is, since the patch itself adds some memory barrier, > some regression in block IO area is kind of expected. > > after more internal review, we still decided to report out to share our finding > in our tests, and for your information that how this patch could impact > performance in some cases. please let us know if you have any concern. > > Thanks a lot! > > below is the full report. > > > Greeting, > > FYI, we noticed a -26.5% regression of fxmark.ssd_ext4_no_jnl_DWTL_54_directio.works/sec due to commit: Due to some bug in regzbot (one I saldy have no time to look into right now) regzbot didn't see the fix for this, so let's do it manually: #regzbot fixed-by: 2f79cdfe58c13949bbbb6 Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat) P.S.: As the Linux kernel's regression tracker I deal with a lot of reports and sometimes miss something important when writing mails like this. If that's the case here, don't hesitate to tell me in a public reply, it's in everyone's interest to set the public record straight.