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Wed, 17 Aug 2022 11:09:47 -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: <85a141ae-56a7-4dcd-b75a-04be4b276b3a@www.fastmail.com> In-Reply-To: <20220817114933.66c4g4xjsi4df2tg@quack3> References: <61e5ccda-a527-4fea-9850-91095ffa91c4@www.fastmail.com> <4995baed-c561-421d-ba3e-3a75d6a738a3@www.fastmail.com> <2b8a38fa-f15f-45e8-8caa-61c5f8cd52de@www.fastmail.com> <7c830487-95a6-b008-920b-8bc4a318f10a@applied-asynchrony.com> <20220817114933.66c4g4xjsi4df2tg@quack3> Date: Wed, 17 Aug 2022 11:09:26 -0400 From: "Chris Murphy" To: "Jan Kara" , =?UTF-8?Q?Holger_Hoffst=C3=A4tte?= Cc: "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 7:49 AM, Jan Kara wrote: > > Another thing worth trying is to compile the kernel without > CONFIG_BFQ_GROUP_IOSCHED. That will essentially disable cgroup support in > BFQ so we will see whether the problem may be cgroup related or not. The problem happens with a 5.12.0 kernel built without CONFIG_BFQ_GROUP_IOSCHED. -- Chris Murphy