Re: [PATCH 6.4 800/800] io_uring: Use io_schedule* in cqring wait

[Linux regression tracking #update (Thorsten Leemhuis)]

On 23.07.23 14:11, Linux regression tracking #adding (Thorsten Leemhuis)
wrote:
> On 23.07.23 11:39, Oleksandr Natalenko wrote:
>> On neděle 16. července 2023 21:50:53 CEST Greg Kroah-Hartman wrote:
>>> From: Andres Freund <andres@xxxxxxxxxxx>
>>>
>>> commit 8a796565cec3601071cbbd27d6304e202019d014 upstream.
>>>
>>> I observed poor performance of io_uring compared to synchronous IO. That
>>> turns out to be caused by deeper CPU idle states entered with io_uring,
>>> due to io_uring using plain schedule(), whereas synchronous IO uses
>>> io_schedule().

> #regzbot introduced 8a796565cec360107 ^
> https://bbs.archlinux.org/viewtopic.php?id=287343
> https://bugzilla.kernel.org/show_bug.cgi?id=217700
> https://bugzilla.kernel.org/show_bug.cgi?id=217699
> #regzbot title block: io_uring: high iowait rates and stalls
> #regzbot ignore-activity

Apparently expected behavior:
https://lore.kernel.org/lkml/538065ee-4130-6a00-dcc8-f69fbc7d7ba0@xxxxxxxxx/

#regzbot resolve: notabug: on a closer look it turned out that's
expected behavior

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
--
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#regzbot ignore-activity