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Re: seems to be a flaw in cfq [message #9182 is a reply to message #9181]

Thu, 21 December 2006 09:14

Jens Axboe
Messages: 30
Registered: October 2006

Member

On Thu, Dec 21 2006, Vasily Tarasov wrote:
> Hello, Jens,
>
> Sorry for late answer.
> The situation is the following:
>
> direct seqread
> (2.6.18) - reproducable
> (2.6.20-rc1) - reproducable
> (2.6.20-rc1 + your fix) - not reproducable
>
> buffered randread
> (2.6.18) - reproducable
> (2.6.20-rc1) - not reproducable
> (2.6.20-rc1 + your fix) - not reproducable
>
> So the conclusion: problem with "direct seqread" is fixed by your patch
> (thanks!) and
> the problem with "buffered randread" was fixed in 2.6.19/2.6.20.

Perfect, explains why I didn't see much badness with buffered io on
2.6.20-rc1'ish. Thanks for retesting and the initial report, the fix I
sent you is going upstream (sitting in the 'for-linus' branch awaiting a
pull) for 2.6.20-rc2.

--
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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