From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760454AbXGDKW7 (ORCPT ); Wed, 4 Jul 2007 06:22:59 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757955AbXGDKWu (ORCPT ); Wed, 4 Jul 2007 06:22:50 -0400 Received: from lucidpixels.com ([75.144.35.66]:51477 "EHLO lucidpixels.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757433AbXGDKWt (ORCPT ); Wed, 4 Jul 2007 06:22:49 -0400 Date: Wed, 4 Jul 2007 06:22:48 -0400 (EDT) From: Justin Piszcz X-X-Sender: jpiszcz@p34.internal.lan To: Michael Tokarev cc: Tejun Heo , Kernel Mailing List , linux-ide@vger.kernel.org, linux-scsi@vger.kernel.org Subject: Re: Some NCQ numbers... In-Reply-To: <468B6BD7.9010108@msgid.tls.msk.ru> 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 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org 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