linux-kernel - Re: Some NCQ numbers...

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Date:	Wed, 4 Jul 2007 06:33:06 -0400 (EDT)
From:	Justin Piszcz <jpiszcz@...idpixels.com>
To:	Michael Tokarev <mjt@....msk.ru>
cc:	Tejun Heo <htejun@...il.com>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-ide@...r.kernel.org, linux-scsi@...r.kernel.org
Subject: Re: Some NCQ numbers...



On Wed, 4 Jul 2007, Justin Piszcz wrote:

> On Wed, 4 Jul 2007, Michael Tokarev wrote:
> 
> > Tejun Heo wrote:
> >> Hello,
> >>
> >> Michael Tokarev wrote:
> >>> Well.  It looks like the results does not depend on the
> >>> elevator.  Originally I tried with deadline, and just
> >>> re-ran the test with noop (hence the long delay with
> >>> the answer) - changing linux elevator changes almost
> >>> nothing in the results - modulo some random "fluctuations".
> >>
> >> I see.  Thanks for testing.
> >
> > Here are actual results - the tests were still running when
> > I replied yesterday.
> >
> > Again, this is Seagate ST3250620AS "desktop" drive, 7200RPM,
> > 16Mb cache, 250Gb capacity.  The tests were performed with
> > queue depth = 64 (on mptsas), drive write cache is turned
> > off.
> 
> I found AS scheduler to be the premium and best for single-user performance.
> 
> You want speed? Use AS.
> 
> http://home.comcast.net/~jpiszcz/sched/cfq_vs_as_vs_deadline_vs_noop.html
> 
>

Does not include noop-- tested the main three though, renamed :)

http://home.comcast.net/~jpiszcz/sched/cfq_vs_as_vs_deadline.html

And for the archives:

p34-cfq,15696M,77114.3,99,311683,55.3333,184947,38.6667,79842.7,99,524065,41.3333,634.033,0.333333,16:100000:16/64,1043.33,8.33333,4419.33,11.6667,2942,17.3333,1178,10.3333,4192.67,12.3333,2619.33,19
p34-as,15696M,76202.3,99,443103,85,189716,34.6667,79552,99,507271,39.6667,607.067,0,16:100000:16/64,1153,10,13434,36,2769.67,16.3333,1201.67,10.6667,3951.33,12,2665.67,19
p34-deadline,15696M,76933.3,98.6667,386852,72,183016,29.6667,79530.7,99,512082,39.6667,678.567,0,16:100000:16/64,1230.33,10.3333,12349,32.3333,2945,17.3333,1258,11,8183,22.3333,2867,20.3333

Justin.
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