From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B860FC64EC7 for ; Wed, 1 Mar 2023 07:34:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229688AbjCAHea (ORCPT ); Wed, 1 Mar 2023 02:34:30 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40954 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229560AbjCAHe1 (ORCPT ); Wed, 1 Mar 2023 02:34:27 -0500 Received: from wp530.webpack.hosteurope.de (wp530.webpack.hosteurope.de [80.237.130.52]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AC41E1517C; Tue, 28 Feb 2023 23:34:26 -0800 (PST) Received: from [2a02:8108:8980:2478:8cde:aa2c:f324:937e]; authenticated by wp530.webpack.hosteurope.de running ExIM with esmtpsa (TLS1.3:ECDHE_RSA_AES_128_GCM_SHA256:128) id 1pXGyl-0000Uc-Mv; Wed, 01 Mar 2023 08:34:23 +0100 Message-ID: Date: Wed, 1 Mar 2023 08:34:23 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.8.0 Subject: Re: [Regression] Bug 216961 - Severe IO scheduling starvation issues with btrfs Content-Language: en-US, de-DE To: Paolo Valente , Jens Axboe Cc: Josef Bacik , David Sterba , Chris Mason , linux-btrfs , LKML , Wyatt Childers , pmacedo@gmail.com, Linux regressions mailing list , dsterba@suse.cz References: <0ca02b1f-ab00-9fa6-aecc-c2c46d624e49@leemhuis.info> <06a5ada1-d1b8-3139-3a60-f43958f90f79@leemhuis.info> <20230228194039.GP10580@suse.cz> From: "Linux regression tracking (Thorsten Leemhuis)" Reply-To: Linux regressions mailing list In-Reply-To: <20230228194039.GP10580@suse.cz> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-bounce-key: webpack.hosteurope.de;regressions@leemhuis.info;1677656066;a6dd2248; X-HE-SMSGID: 1pXGyl-0000Uc-Mv Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 28.02.23 20:40, David Sterba wrote: > On Fri, Feb 17, 2023 at 06:17:58AM +0100, Linux regression tracking (Thorsten Leemhuis) wrote: >> On 16.02.23 23:39, Josef Bacik wrote: >>> On Thu, Feb 16, 2023 at 12:43 PM Thorsten Leemhuis >>> wrote: >>>> >>>> I might be missing something, but it looks like the report was ignored. >>>> Is there a reason for that? >>> Mostly just being blind. >> Happens. >> >>> I've responded to the BZ, I'll investigate >>> through the BZ. > According to the bug it's a problem in BFQ. Yeah, I noticed yesterday, after I looked into the issue again, as it looked stalled. But as I already wrote in a comment in the ticket yesterday: Did anyone tell the bfq developers about this? Doesn't look like it. Adding them to the list of recipients them now, even if they might know about it. If not: Paolo, Jens, there seems to be a regression in BFQ likely introduced between 5.19 and 6.0 that people apparently notice often with Btrfs. For details see: https://bugzilla.kernel.org/show_bug.cgi?id=216961 Josef apparently has seen report about this as well where switching to another io scheduler helped: https://bugzilla.kernel.org/show_bug.cgi?id=216961#c8 Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat) -- Everything you wanna know about Linux kernel regression tracking: https://linux-regtracking.leemhuis.info/about/#tldr If I did something stupid, please tell me, as explained on that page. #regzbot title: bfq: severe IO scheduling starvation issues with btrfs