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