Messages in this thread | | | Date | Thu, 10 Jul 2008 15:17:47 +0200 | From | Martin Sustrik <> | Subject | Re: Higher than expected disk write(2) latency |
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Hi Alan,
>> What we see is that AIO performs rather bad while we are still >> enqueueing more writes (it misses right position on the disk and has to >> do superfluous disk revolvings), however, once we stop enqueueing new >> write request, those already in the queue are processed swiftly. > > Which disk scheduler are you using - some of the disk schedulers > intentionally delay writes to try and get better block merging.
It's CFQ. Does it delay writes? And if so, what should we use instead?
Thanks. Martin
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