linux-kernel - Re: [LKP] Re: [io_uring] 584b0180f0: phoronix-test-suite.fio.SequentialWrite.IO_uring.Yes.Yes.1MB.DefaultTestDirectory.mb

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Date:   Thu, 21 Jul 2022 11:08:14 +0800
From:   Yin Fengwei <fengwei.yin@...el.com>
To:     Jens Axboe <axboe@...nel.dk>,
        kernel test robot <oliver.sang@...el.com>
CC:     LKML <linux-kernel@...r.kernel.org>, <io-uring@...r.kernel.org>,
        <lkp@...ts.01.org>, <lkp@...el.com>
Subject: Re: [LKP] Re: [io_uring] 584b0180f0:
 phoronix-test-suite.fio.SequentialWrite.IO_uring.Yes.Yes.1MB.DefaultTestDirectory.mb_s
 -10.2% regression

Hi Jens,

On 7/21/2022 1:24 AM, Jens Axboe wrote:
> I think this turned out to be a little bit of a goose chase. What's
> happening here is that later kernels defer the file assignment, which
> means it isn't set if a request is queued with IOSQE_ASYNC. That in
> turn, for writes, means that we don't hash it on io-wq insertion, and
> then it doesn't get serialized with other writes to that file.
Thanks a lot for the detail behavior explanation.


Regards
Yin, Fengwei