Messages in this thread | | | Date | Mon, 7 Dec 2009 15:41:50 +0100 | From | Jens Axboe <> | Subject | Re: [PATCH] cfq-iosched: reduce write depth only if sync was delayed |
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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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