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Message-ID: <BYAPR21MB1270F7AC484CBDFD94B10726BF5C9@BYAPR21MB1270.namprd21.prod.outlook.com> Date: Sat, 22 Jan 2022 06:14:33 +0000 From: Dexuan Cui <decui@...rosoft.com> To: Oliver Sang <oliver.sang@...el.com>, Jens Axboe <axboe@...nel.dk>, Yin Fengwei <fengwei.yin@...el.com>, "linux-block@...r.kernel.org" <linux-block@...r.kernel.org> CC: "Alex Xu (Hello71)" <alex_y_xu@...oo.ca>, "ming.lei@...hat.com" <ming.lei@...hat.com>, "hch@....de" <hch@....de>, Long Li <longli@...rosoft.com>, "Michael Kelley (LINUX)" <mikelley@...rosoft.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "Li, Philip" <philip.li@...el.com>, Rakesh Ginjupalli <Rakesh.Ginjupalli@...rosoft.com> Subject: RE: RE: very low IOPS due to "block: reduce kblockd_mod_delayed_work_on() CPU consumption" > From: Oliver Sang <oliver.sang@...el.com> > Sent: Tuesday, December 28, 2021 5:49 AM > ... > Hi Jens, Dexuan, > > On Tue, Dec 28, 2021 at 10:30:43AM +0800, Yin Fengwei wrote: > > Hi Jens, Dexuan, > > > > On 12/20/2021 1:15 PM, Dexuan Cui wrote: > > >> From: Jens Axboe <axboe@...nel.dk> > > >> Sent: Sunday, December 19, 2021 7:28 AM > > >>> ... > > >>> Dexuan, can you test this for your test case too? I'm going to queue > > >>> up a revert for -rc6 just in case. > > >> > > >> This one should be better... > > >> ... > > >> Jens Axboe > > > > > > Hi Jens, sorry -- unluckily I lost the test environment.. :-( > > > I pinged the user to set up the test environment again, but he's > > > on vacation till the beginning of January. > > > > We hit this issue in our testing env also and will help to verify > > your fixing patch. Thanks. > > as we reported in [1], we found cb2ac2912a cause big regressions in fxmark > tests. > "[block] cb2ac2912a: > fxmark.ssd_f2fs_dbench_client_4_bufferedio.works/sec -66.0% regression" > > By applying the patch supplied by Jens Axboe in previous thread directly > upon cb2ac2912a, we confirmed the regression could be fixed: > ... > > Regards > > Yin, Fengwei Hi Jens, Fengwei, I finally regained my test evnironment and tested Jens's Dec-19 patch (see https://www.spinics.net/lists/linux-block/msg78065.html) and it also worked fine for me, i.e. no excessive CPU utilization even with the default dm_mod.dm_mq_queue_depth=2048. BTW, Jen's patch is not in the mainline yet. I tested it using the linux-block tree. Thanks, -- Dexuan
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