[lkml]   [2009]   [Dec]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] cfq-iosched: reduce write depth only if sync was delayed
Jens Axboe <> 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.


 \ /
  Last update: 2009-12-07 15:15    [W:0.091 / U:1.504 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site