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SubjectRe: [PATCH] cfq-iosched: reduce write depth only if sync was delayed
On Mon, Dec 07 2009, Jeff Moyer wrote:
> Jens Axboe <jens.axboe@oracle.com> writes:
>
> > On Sun, Dec 06 2009, Corrado Zoccolo wrote:
> >> Hi Jeff,
> >> I remember you saw large performance drop on your SAN for sequential
> >> writes with low_latency=1. Can you test if Shaohua's and this patch
> >> fix allow to recover some bandwidth? I think that enabling the queue
> >> depth ramp up only if a sync request was delayed should disable it for
> >> fast hardware like yours, so you should not be seeing the slowdown any
> >> more.
> >
> > I queued this up for post inclusion into 2.6.33, with the time_after()
> > fixed.
> >
> > The patch was word-wrapped, btw.
>
> So in what branch can I find this fix? Once I know that I can queue up
> some tests.

It's in next-2.6.33

--
Jens Axboe



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