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Re: seems to be a flaw in cfq [message #9165 is a reply to message #9164]

Wed, 20 December 2006 09:38

Jens Axboe
Messages: 30
Registered: October 2006

Member

On Wed, Dec 20 2006, Jens Axboe wrote:
> I'm still seeing odd results with buffered io, while the direct case is
> definitely fixed. So we are either looking at two bugs, or one bug that
> the merge fixup hides.

Ah hang on, buffered reads will be serialized by the page cache. If I
rerun the buffered randread case with anticipatory, the results are
skewed in the other direction but still unfair. So I'm not sure there's
a real bug there in the io scheduler.

--
Jens Axboe

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[Message index]

		seems to be a flaw in cfq By: Vasily Tarasov on Tue, 19 December 2006 13:53
		Re: seems to be a flaw in cfq By: Jens Axboe on Tue, 19 December 2006 14:37
		Re: seems to be a flaw in cfq By: Jens Axboe on Tue, 19 December 2006 14:54
		Re: seems to be a flaw in cfq By: Jens Axboe on Tue, 19 December 2006 14:59
		Re: seems to be a flaw in cfq By: Jens Axboe on Tue, 19 December 2006 18:47
		Re: seems to be a flaw in cfq By: Vasily Tarasov on Wed, 20 December 2006 07:09
		Re: seems to be a flaw in cfq By: Jens Axboe on Wed, 20 December 2006 09:33
		Re: seems to be a flaw in cfq By: Jens Axboe on Wed, 20 December 2006 09:35
		Re: seems to be a flaw in cfq By: Jens Axboe on Wed, 20 December 2006 09:38
		Re: seems to be a flaw in cfq By: Vasily Tarasov on Thu, 21 December 2006 09:03
		Re: seems to be a flaw in cfq By: Jens Axboe on Thu, 21 December 2006 09:14
		Re: seems to be a flaw in cfq By: Jens Axboe on Thu, 21 December 2006 09:15
		Re: seems to be a flaw in cfq By: Vasily Tarasov on Thu, 21 December 2006 12:16
		Re: seems to be a flaw in cfq By: Jens Axboe on Thu, 21 December 2006 13:41
		Re: seems to be a flaw in cfq By: Vasily Tarasov on Thu, 21 December 2006 15:49
		Re: seems to be a flaw in cfq By: Jens Axboe on Thu, 21 December 2006 15:58
		Re: seems to be a flaw in cfq By: Vasily Tarasov on Fri, 22 December 2006 06:27
		Re: seems to be a flaw in cfq By: Jens Axboe on Fri, 22 December 2006 09:37

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