I'm one of many who are affected by kernel bug 12309 ( http://bugzilla.kernel.org/show_bug.cgi?id=12309 ) and as you can see, the major symptom is that desktop responsivness taking a hit during heavy I/O operations. Thing is, there is no way to measure desktop responsiveness objectively that I know of. Could it be possible to see PTS to include such a test in the future? it would be quite helpful and useful for future usage i'm sure
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measuring desktop responsiveness?
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I have an idea for possibly making an automated test of this... Will check when I am back in the office.
MichaelMichael Larabel
https://www.michaellarabel.com/
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Originally posted by KhaaL View PostI'm one of many who are affected by kernel bug 12309 ( http://bugzilla.kernel.org/show_bug.cgi?id=12309 ) and as you can see, the major symptom is that desktop responsivness taking a hit during heavy I/O operations. Thing is, there is no way to measure desktop responsiveness objectively that I know of. Could it be possible to see PTS to include such a test in the future? it would be quite helpful and useful for future usage i'm sureLast edited by kraftman; 22 April 2009, 04:35 PM.
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Originally posted by Michael View PostI have an idea for possibly making an automated test of this... Will check when I am back in the office.
Michael
Originally posted by kraftman View PostMaybe you should try 2.6.30-rc3, because there are "some block IO scheduling fixes". Btw. is this bug confirmed by kernel devs? As I remember there was something about this or similar issue at lkml, but it wasn't really bug. What fs are you using? You suffer from this bug doing what operations? Are you using FUSE?
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There is a test case which makes it possible to measure the desktop responsiveness latencies.
See comment:
Test case:
The problem is, that this bug is not deterministic. You can create heavy io without notice the bug, but mostly there is the poor desktop responsiveness.
See the three test results of 2.6.29 or 2.6.30-rc2-smp in the result log.
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Originally posted by grigi View PostI have the same issue with a box using XFS, I found it kind-of unexplainable, but going though that bug it makes sense now
Last edited by kraftman; 23 April 2009, 01:44 PM.
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This bug exists since 2.6.18 or even earlier. The real cause is unknowns. There were many tries to fix this bug in ext3 implementation, block layer, io scheduler or event cpu scheduler, without real improvements.
bug in bugzilla
bug in ubuntu's launchpad
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