From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754085AbZJBQvc (ORCPT ); Fri, 2 Oct 2009 12:51:32 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753137AbZJBQvb (ORCPT ); Fri, 2 Oct 2009 12:51:31 -0400 Received: from turing-police.cc.vt.edu ([128.173.14.107]:51638 "EHLO turing-police.cc.vt.edu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751746AbZJBQvb (ORCPT ); Fri, 2 Oct 2009 12:51:31 -0400 X-Mailer: exmh version 2.7.2 01/07/2005 with nmh-1.2 To: Vivek Goyal Cc: Mike Galbraith , Corrado Zoccolo , Jens Axboe , Ingo Molnar , Ulrich Lukas , linux-kernel@vger.kernel.org, containers@lists.linux-foundation.org, dm-devel@redhat.com, nauman@google.com, dpshah@google.com, lizf@cn.fujitsu.com, mikew@google.com, fchecconi@gmail.com, paolo.valente@unimore.it, ryov@valinux.co.jp, fernando@oss.ntt.co.jp, jmoyer@redhat.com, dhaval@linux.vnet.ibm.com, balbir@linux.vnet.ibm.com, righi.andrea@gmail.com, m-ikeda@ds.jp.nec.com, agk@redhat.com, akpm@linux-foundation.org, peterz@infradead.org, jmarchan@redhat.com, torvalds@linux-foundation.org, riel@redhat.com Subject: Re: IO scheduler based IO controller V10 In-Reply-To: Your message of "Fri, 02 Oct 2009 11:40:20 EDT." <20091002154020.GC4494@redhat.com> From: Valdis.Kletnieks@vt.edu References: <200910021255.27689.czoccolo@gmail.com> <20091002124921.GA4494@redhat.com> <4e5e476b0910020827s23e827b1n847c64e355999d4a@mail.gmail.com> <1254497520.10392.11.camel@marge.simson.net> <20091002154020.GC4494@redhat.com> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="==_Exmh_1254502217_3334P"; micalg=pgp-sha1; protocol="application/pgp-signature" Content-Transfer-Encoding: 7bit Date: Fri, 02 Oct 2009 12:50:17 -0400 Message-ID: <12774.1254502217@turing-police.cc.vt.edu> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --==_Exmh_1254502217_3334P Content-Type: text/plain; charset=us-ascii On Fri, 02 Oct 2009 11:40:20 EDT, Vivek Goyal said: > In that case, Corrado's suggestion of refining it further and disabling idling > for seeky process only on non-rotational media (SSD and hardware RAID), makes > sense to me. Umm... I got petabytes of hardware RAID across the hall that very definitely *is* rotating. Did you mean "SSD and disk systems with big honking caches that cover up the rotation"? Because "RAID" and "big honking caches" are not *quite* the same thing, and I can just see that corner case coming out to bite somebody on the ass... --==_Exmh_1254502217_3334P Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) Comment: Exmh version 2.5 07/13/2001 iD8DBQFKxi9JcC3lWbTT17ARApP2AJ4i2rJ5d8WCfE9DU/OfTmNPSD1P/ACg1mVC KmoukBpnPxlD7yD8IMZMXw0= =qKY6 -----END PGP SIGNATURE----- --==_Exmh_1254502217_3334P-- From mboxrd@z Thu Jan 1 00:00:00 1970 From: Valdis.Kletnieks@vt.edu Subject: Re: IO scheduler based IO controller V10 Date: Fri, 02 Oct 2009 12:50:17 -0400 Message-ID: <12774.1254502217@turing-police.cc.vt.edu> References: <200910021255.27689.czoccolo@gmail.com> <20091002124921.GA4494@redhat.com> <4e5e476b0910020827s23e827b1n847c64e355999d4a@mail.gmail.com> <1254497520.10392.11.camel@marge.simson.net> <20091002154020.GC4494@redhat.com> Reply-To: device-mapper development Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============2081582937==" Return-path: In-Reply-To: Your message of "Fri, 02 Oct 2009 11:40:20 EDT." <20091002154020.GC4494@redhat.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com To: Vivek Goyal Cc: dhaval@linux.vnet.ibm.com, peterz@infradead.org, Corrado Zoccolo , dm-devel@redhat.com, dpshah@google.com, Jens Axboe , agk@redhat.com, balbir@linux.vnet.ibm.com, paolo.valente@unimore.it, jmarchan@redhat.com, fernando@oss.ntt.co.jp, Ulrich Lukas , mikew@google.com, jmoyer@redhat.com, nauman@google.com, Ingo Molnar , m-ikeda@ds.jp.nec.com, riel@redhat.com, lizf@cn.fujitsu.com, fchecconi@gmail.com, containers@lists.linux-foundation.org, Mike Galbraith , linux-kernel@vger.kernel.org, akpm@linux-foundation.org, righi.andrea@gmail.com, torvalds@linux-foundation.org List-Id: dm-devel.ids --===============2081582937== Content-Type: multipart/signed; boundary="==_Exmh_1254502217_3334P"; micalg=pgp-sha1; protocol="application/pgp-signature" Content-Transfer-Encoding: 7bit --==_Exmh_1254502217_3334P Content-Type: text/plain; charset=us-ascii On Fri, 02 Oct 2009 11:40:20 EDT, Vivek Goyal said: > In that case, Corrado's suggestion of refining it further and disabling idling > for seeky process only on non-rotational media (SSD and hardware RAID), makes > sense to me. Umm... I got petabytes of hardware RAID across the hall that very definitely *is* rotating. Did you mean "SSD and disk systems with big honking caches that cover up the rotation"? Because "RAID" and "big honking caches" are not *quite* the same thing, and I can just see that corner case coming out to bite somebody on the ass... --==_Exmh_1254502217_3334P Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (GNU/Linux) Comment: Exmh version 2.5 07/13/2001 iD8DBQFKxi9JcC3lWbTT17ARApP2AJ4i2rJ5d8WCfE9DU/OfTmNPSD1P/ACg1mVC KmoukBpnPxlD7yD8IMZMXw0= =qKY6 -----END PGP SIGNATURE----- --==_Exmh_1254502217_3334P-- --===============2081582937== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline --===============2081582937==--