linux-ext4 - [Bug 42895] jbd2 makes all system unresponsive

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Message-Id: <20120517211825.DD9BC11FCF6@bugzilla.kernel.org>
Date:	Thu, 17 May 2012 21:18:25 +0000 (UTC)
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 42895] jbd2 makes all system unresponsive

https://bugzilla.kernel.org/show_bug.cgi?id=42895

Sami Liedes <sliedes@...hut.fi> changed:

           What    |Removed                     |Added
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                 CC|                            |sliedes@...hut.fi

--- Comment #19 from Sami Liedes <sliedes@...hut.fi>  2012-05-17 21:18:25 ---
I have seen this too; basically latencies have always been a problem with KDE
(at least KDE 4) on ext4, as far as I can tell. Switching to XFS solved the
problem for me.

One thing I might be able to add to the discussion:

While this problem manifests without disk crypto, adding dm-crypt to the soup,
especially on a computer _without_ hardware AES support, generally makes it
*much* worse. I've seen disk accesses, especially fsync()s (per latencytop),
take minutes in the worst case under some medium disk load; 5-10 seconds are a
norm on light I/O load. I can't see much reason why disk crypto should make it
that much slower. But since it's a problem also without crypto, perhaps
dm-crypt just somehow makes it worse and more obvious?

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