From mboxrd@z Thu Jan 1 00:00:00 1970 From: Justin Piszcz Subject: Re: Some NCQ numbers... Date: Mon, 9 Jul 2007 07:07:11 -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> <468D3FD6.7060607@tmr.com> Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Return-path: Received: from lucidpixels.com ([75.144.35.66]:60780 "EHLO lucidpixels.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751236AbXGILHN (ORCPT ); Mon, 9 Jul 2007 07:07:13 -0400 In-Reply-To: <468D3FD6.7060607@tmr.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Bill Davidsen Cc: Michael Tokarev , Tejun Heo , Kernel Mailing List , linux-ide@vger.kernel.org, linux-scsi@vger.kernel.org On Thu, 5 Jul 2007, Bill Davidsen wrote: > Justin Piszcz wrote: >> >> >> 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 > I looked at these before, did you really run with a chunk size of just under > 16GB, or does "15696M" have some inobvious meaning? > > -- > Bill Davidsen > "We have more to fear from the bungling of the incompetent than from > the machinations of the wicked." - from Slashdot > It says to use double your RAM, your RAM is 7848, so that is why I use 15696M :) I did some tests recently, it appears JFS is 20-60MB/s faster for sequential read/writes/re-writes but it does not have a defrag tool, defragfs but its not included in Debian and people say not to use it on Google/so I am not sure I want to go there. Justin.