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From: Valentin Schneider <valentin.schneider@arm.com>
To: Josef Bacik <josef@toxicpanda.com>
Cc: peterz@infradead.org, vincent.guittot@linaro.org,
	torvalds@linux-foundation.org, linux-kernel@vger.kernel.org,
	linux-btrfs@vger.kernel.org
Subject: Re: [REGRESSION] 5-10% increase in IO latencies with nohz balance patch
Date: Mon, 06 Dec 2021 09:48:14 +0000	[thread overview]
Message-ID: <87lf0y9i8x.mognet@arm.com> (raw)
In-Reply-To: <YappSLDS2EvRJmr9@localhost.localdomain>

On 03/12/21 14:00, Josef Bacik wrote:
> On Fri, Dec 03, 2021 at 12:03:27PM +0000, Valentin Schneider wrote:
>> Could you give the 4 top patches, i.e. those above
>> 8c92606ab810 ("sched/cpuacct: Make user/system times in cpuacct.stat more precise")
>> a try?
>>
>> https://git.gitlab.arm.com/linux-arm/linux-vs.git -b mainline/sched/nohz-next-update-regression
>>
>> I gave that a quick test on the platform that caused me to write the patch
>> you bisected and looks like it didn't break the original fix. If the above
>> counter-measures aren't sufficient, I'll have to go poke at your
>> reproducers...
>>
>
> It's better but still around 6% regression.  If I compare these patches to the
> average of the last few days worth of runs you're 5% better than before, so
> progress but not completely erased.
>

Hmph, time for me to reproduce this locally then. Thanks!

  reply	other threads:[~2021-12-06  9:48 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-29 17:03 [REGRESSION] 5-10% increase in IO latencies with nohz balance patch Josef Bacik
2021-11-29 18:03 ` Valentin Schneider
2021-11-29 18:15   ` Josef Bacik
2021-11-29 18:31     ` Valentin Schneider
2021-11-29 19:49       ` Josef Bacik
2021-11-30  0:26         ` Valentin Schneider
2021-12-03 12:03           ` Valentin Schneider
2021-12-03 19:00             ` Josef Bacik
2021-12-06  9:48               ` Valentin Schneider [this message]
2021-12-09 17:22                 ` Valentin Schneider
2021-12-09 19:16                   ` Josef Bacik
2021-12-22 12:42                     ` Thorsten Leemhuis
2021-12-22 16:07                       ` Valentin Schneider
2022-01-03 16:16                         ` Josef Bacik
2022-01-13 16:41                           ` Valentin Schneider
2022-01-13 16:57                             ` Roman Gushchin
2022-02-18 11:00                               ` Thorsten Leemhuis
2022-02-18 15:34                                 ` Josef Bacik
2021-11-30  7:16 ` Thorsten Leemhuis
2022-01-16  7:30   ` [REGRESSION] 5-10% increase in IO latencies with nohz balance patch #forregzbot Thorsten Leemhuis

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