Comment 54 for bug 595047
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#54 |
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bbfa235
(Get the code!)
(In reply to comment #11)
> I have found that this may be an issue with the Complete Fair Queuing I/O
> scheduler that was introduced as default in 2.6.18 (when most started
> observing
> this performance issue). Reverting back to the old AS scheduler for me seems
> to have resolved the problem.
>
> To use the AS scheduler and test for yourself, just specify "elevator=as" as
> a
> boot option.
>
Fwiw, I've never used the CFQ scheduler. I'm on the deadline scheduler with my 3ware 9560SE and still see this problem crop up from time to time, usually when doing a file copy large enough to fill the page cache.