Re: [PATCH] cfq-iosched: reduce write depth only if sync wasdelayed

[Jens Axboe]

On Mon, Dec 07 2009, Jeff Moyer wrote:
> Jens Axboe <jens.axboe@xxxxxxxxxx> 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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/