From mboxrd@z Thu Jan 1 00:00:00 1970 From: Justin Piszcz Subject: Re: Some NCQ numbers... Date: Wed, 4 Jul 2007 06:33:06 -0400 (EDT) Message-ID: References: <468392CE.6010206@msgid.tls.msk.ru> <468A06A0.1020802@gmail.com> <468AB1A7.9010201@msgid.tls.msk.ru> <468AF5BB.10005@gmail.com> <468B6BD7.9010108@msgid.tls.msk.ru> Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Return-path: In-Reply-To: Sender: linux-scsi-owner@vger.kernel.org To: Michael Tokarev Cc: Tejun Heo , Kernel Mailing List , linux-ide@vger.kernel.org, linux-scsi@vger.kernel.org List-Id: linux-ide@vger.kernel.org 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.