RE: very low IOPS due to "block: reduce kblockd_mod_delayed_work_on() CPU consumption"

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To: Jens Axboe <axboe@xxxxxxxxx>, "Alex Xu (Hello71)" <alex_y_xu@xxxxxxxx>, "linux-block@xxxxxxxxxxxxxxx" <linux-block@xxxxxxxxxxxxxxx>, "ming.lei@xxxxxxxxxx" <ming.lei@xxxxxxxxxx>, "hch@xxxxxx" <hch@xxxxxx>, Long Li <longli@xxxxxxxxxxxxx>, "Michael Kelley (LINUX)" <mikelley@xxxxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>
Subject: RE: very low IOPS due to "block: reduce kblockd_mod_delayed_work_on() CPU consumption"
From: Dexuan Cui <decui@xxxxxxxxxxxxx>
Date: Mon, 20 Dec 2021 05:15:39 +0000
Accept-language: en-US
In-reply-to: <237bd7d8-9e75-01b5-ebe7-8b1eb747474b@kernel.dk>
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References: <1639853092.524jxfaem2.none.ref@localhost> <1639853092.524jxfaem2.none@localhost> <7d1e4bb8-1a73-9529-3191-66df4ff2d5fe@kernel.dk> <12f43a71-713b-a74f-a169-b6ac3d804e50@kernel.dk> <237bd7d8-9e75-01b5-ebe7-8b1eb747474b@kernel.dk>

> From: Jens Axboe <axboe@xxxxxxxxx>
> 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.

Follow-Ups:
- Re: RE: very low IOPS due to "block: reduce kblockd_mod_delayed_work_on() CPU consumption"
  - From: Yin Fengwei

References:
- very low IOPS due to "block: reduce kblockd_mod_delayed_work_on() CPU consumption"
  - From: Alex Xu (Hello71)
- Re: very low IOPS due to "block: reduce kblockd_mod_delayed_work_on() CPU consumption"
  - From: Jens Axboe
- Re: very low IOPS due to "block: reduce kblockd_mod_delayed_work_on() CPU consumption"
  - From: Jens Axboe
- Re: very low IOPS due to "block: reduce kblockd_mod_delayed_work_on() CPU consumption"
  - From: Jens Axboe

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