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From: "François-Xavier Thomas" <fx.thomas@gmail.com>
To: linux-btrfs@vger.kernel.org
Subject: Massive I/O usage from btrfs-cleaner after upgrading to 5.16
Date: Mon, 17 Jan 2022 11:06:42 +0100	[thread overview]
Message-ID: <CAEwRaO4y3PPPUdwYjNDoB9m9CLzfd3DFFk2iK1X6OyyEWG5-mg@mail.gmail.com> (raw)

Hello all,

Just in case someone is having the same issue: Btrfs (in the
btrfs-cleaner process) is taking a large amount of disk IO after
upgrading to 5.16 on one of my volumes, and multiple other people seem
to be having the same issue, see discussion in [0].

[1] is a close-up screenshot of disk I/O history (blue line is write
ops, going from a baseline of some 10 ops/s to around 1k ops/s). I
downgraded from 5.16 to 5.15 in the middle, which immediately restored
previous performance.

Common options between affected people are: ssd, autodefrag. No error
in the logs, and no other issue aside from performance (the volume
works just fine for accessing data).

One person reports that SMART stats show a massive amount of blocks
being written; unfortunately I do not have historical data for that so
I cannot confirm, but this sounds likely given what I see on what
should be a relatively new SSD.

Any idea of what it could be related to?

François-Xavier

[0] https://www.reddit.com/r/btrfs/comments/s4nrzb/massive_performance_degradation_after_upgrading/
[1] https://imgur.com/oYhYat1

             reply	other threads:[~2022-01-17 10:06 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-17 10:06 François-Xavier Thomas [this message]
2022-01-17 12:02 ` Filipe Manana
2022-01-17 16:59   ` Filipe Manana
2022-01-17 21:37     ` François-Xavier Thomas
2022-01-19  9:44       ` François-Xavier Thomas
2022-01-19 10:13         ` Filipe Manana
2022-01-20 11:37           ` François-Xavier Thomas
2022-01-20 11:44             ` Filipe Manana
2022-01-20 12:02               ` François-Xavier Thomas
2022-01-20 12:45                 ` Qu Wenruo
2022-01-20 12:55                   ` Filipe Manana
2022-01-20 17:46                 ` Filipe Manana
2022-01-20 18:21                   ` François-Xavier Thomas
2022-01-21 10:49                     ` Filipe Manana
2022-01-21 19:39                       ` François-Xavier Thomas
2022-01-21 23:34                         ` Qu Wenruo
2022-01-22 18:20                           ` François-Xavier Thomas
2022-01-24  7:00                             ` Qu Wenruo
2022-01-25 20:00                               ` François-Xavier Thomas
2022-01-25 23:29                                 ` Qu Wenruo

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