lkml.org 
[lkml]   [2021]   [Dec]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: very low IOPS due to "block: reduce kblockd_mod_delayed_work_on() CPU consumption"
From
Date
On 12/18/21 11:57 AM, Alex Xu (Hello71) wrote:
> Hi,
>
> I recently noticed that between 6441998e2e and 9eaa88c703, I/O became
> much slower on my machine using ext4 on dm-crypt on NVMe with bfq
> scheduler. Checking iostat during heavy usage (find / -xdev and fstrim
> -v /), maximum IOPS had fallen from ~10000 to ~100. Reverting cb2ac2912a
> ("block: reduce kblockd_mod_delayed_work_on() CPU consumption") resolves
> the issue.

Hmm interesting. I'll try and see if I can reproduce this and come up
with a fix.

--
Jens Axboe

\
 
 \ /
  Last update: 2021-12-18 20:02    [W:0.114 / U:1.240 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site