[Bug 42895] jbd2 makes all system unresponsive

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


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

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--- Comment #19 from Sami Liedes <sliedes@cc.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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