From: "Alex Xu (Hello71)" <alex_y_xu@yahoo.ca>
To: Jens Axboe <axboe@kernel.dk>,
linux-block@vger.kernel.org, Dexuan Cui <decui@microsoft.com>,
ming.lei@redhat.com, hch@lst.de, Long Li <longli@microsoft.com>,
"Michael Kelley (LINUX)" <mikelley@microsoft.com>,
linux-kernel@vger.kernel.org
Subject: very low IOPS due to "block: reduce kblockd_mod_delayed_work_on() CPU consumption"
Date: Sat, 18 Dec 2021 13:57:15 -0500 [thread overview]
Message-ID: <1639853092.524jxfaem2.none@localhost> (raw)
In-Reply-To: 1639853092.524jxfaem2.none.ref@localhost
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.
Thanks,
Alex.
next parent reply other threads:[~2021-12-18 18:57 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1639853092.524jxfaem2.none.ref@localhost>
2021-12-18 18:57 ` Alex Xu (Hello71) [this message]
2021-12-18 19:02 ` very low IOPS due to "block: reduce kblockd_mod_delayed_work_on() CPU consumption" Jens Axboe
2021-12-19 14:58 ` Jens Axboe
2021-12-19 15:28 ` Jens Axboe
2021-12-20 5:15 ` Dexuan Cui
2021-12-28 2:30 ` Yin Fengwei
2021-12-28 13:49 ` Oliver Sang
2022-01-22 6:14 ` Dexuan Cui
2022-02-08 18:34 ` Dexuan Cui
2021-12-23 11:50 ` Christoph Hellwig
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