See also Bug 381300, Bug 131094 and others. There has been a lot of
discussion from people far more knowledgeable about kernel issues and IO
WAIT than I. The truly wacky thing here is that I see this problem in
Karmic when doing nothing more than just TYPING. If I run LatencyTop,
I've seen:
EXT3: Waiting for journal access 9959.4 msec 93.4 %
I've tried switching to data=writeback, but that has not fixed the
issue. I have run the fsync-tester, from
http://bugzilla.kernel.org/show_bug.cgi?id=12309, and received figures
such as:
fsync time: 0.0293
fsync time: 0.0293
fsync time: 6.3766
fsync time: 0.0269
fsync time: 0.0258
fsync time: 0.6859
fsync time: 0.0255
fsync time: 0.0258
fsync time: 2.4765
fsync time: 0.0275
fsync time: 0.6968
fsync time: 1.7163
fsync time: 0.0270
fsync time: 0.0250
fsync time: 1.1506
fsync time: 0.6978
fsync time: 20.6614
fsync time: 0.0272
fsync time: 0.0278
fsync time: 0.0268
fsync time: 0.0329
fsync time: 0.0261
fsync time: 4.6135
fsync time: 1.9741
fsync time: 14.4094
fsync time: 0.8622
fsync time: 0.0273
fsync time: 0.0256
fsync time: 0.0354
fsync time: 0.0279
The larger numbers corresponding to times when the system is
unresponsive. If I keeping typing while the system feels frozen, I can
even get the Firefox windows to be marked gray until I stop typing and
let the system recover.
** Bug watch added: Linux Kernel Bug Tracker #12309
http://bugzilla.kernel.org/show_bug.cgi?id=12309
--
Multiple GUI apps freezing with high I/O wait during typing
https://bugs.launchpad.net/bugs/417041
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