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Wed, 17 Aug 2022 14:55:17 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface User-Agent: Cyrus-JMAP/3.7.0-alpha0-841-g7899e99a45-fm-20220811.002-g7899e99a Mime-Version: 1.0 Message-Id: <2f252399-0e30-4465-8c02-3f42c145174a@www.fastmail.com> In-Reply-To: <20220817183335.47a4ao26wjopavo2@quack3> References: <2b8a38fa-f15f-45e8-8caa-61c5f8cd52de@www.fastmail.com> <7c830487-95a6-b008-920b-8bc4a318f10a@applied-asynchrony.com> <20220817114933.66c4g4xjsi4df2tg@quack3> <85a141ae-56a7-4dcd-b75a-04be4b276b3a@www.fastmail.com> <20220817163059.kigrvdfmxfswmhls@quack3> <51cd43f9-ab6b-4dd6-814f-e0c1ace3143c@www.fastmail.com> <20220817181554.znqljc6mmci45ukd@quack3> <20220817183335.47a4ao26wjopavo2@quack3> Date: Wed, 17 Aug 2022 14:54:42 -0400 From: "Chris Murphy" To: "Jan Kara" Cc: =?UTF-8?Q?Holger_Hoffst=C3=A4tte?= , "Nikolay Borisov" , "Jens Axboe" , "Paolo Valente" , Linux-RAID , linux-block , linux-kernel , "Josef Bacik" Subject: Re: stalling IO regression since linux 5.12, through 5.18 Content-Type: text/plain X-Spam-Status: No, score=-2.8 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_LOW,SPF_HELO_PASS, SPF_PASS,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Aug 17, 2022, at 2:33 PM, Jan Kara wrote: > On Wed 17-08-22 14:18:01, Chris Murphy wrote: >> >> >> On Wed, Aug 17, 2022, at 2:15 PM, Jan Kara wrote: >> >> > OK, if this indeed passes then b6e68ee82585 ("blk-mq: Improve performance >> > of non-mq IO schedulers with multiple HW queues") might be what's causing >> > issues (although I don't know how yet...). >> >> I can revert it from 5.12.0 and try. Let me know which next test is preferred :) > > Let's try to revert this first so that we have it narrowed down what > started causing the issues. OK I've reverted b6e68ee82585, and removing megaraid_sas.host_tagset_enable=0, and will restart the workload... Usually it's within 10 minutes but the newer the kernel it seems the longer it takes, or the more things I have to throw at it. The problem doesn't reproduce at all with 5.19 series unless I also run a separate dnf install, and that only triggers maybe 1 in 3 times. -- Chris Murphy