Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756635AbZJBQeB (ORCPT ); Fri, 2 Oct 2009 12:34:01 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756104AbZJBQeB (ORCPT ); Fri, 2 Oct 2009 12:34:01 -0400 Received: from mail-gx0-f212.google.com ([209.85.217.212]:51598 "EHLO mail-gx0-f212.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752984AbZJBQeA (ORCPT ); Fri, 2 Oct 2009 12:34:00 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:from:date :x-google-sender-auth:message-id:subject:to:cc:content-type; b=vYry/Avb/d4wNK6Os546adiXUy5OqWZl+TFjB66gpdsVEbmQC1F+zbdGgTTH59HI3k yQ4pjrht4nbCQ4SWYqPE+CJz4hYOMzpH2PbgojXH08pNkF6l6Hb9p5vO9zSXnnOmio5N vOZfOTfMDoEvIL8vz5AwHetNLKYIknEatXuyk= MIME-Version: 1.0 In-Reply-To: <20091002145610.GD31616@kernel.dk> References: <1254340730.7695.32.camel@marge.simson.net> <20090930202447.GA28236@redhat.com> <1254382405.7595.9.camel@marge.simson.net> <20091001185816.GU14918@kernel.dk> <1254464628.7158.101.camel@marge.simson.net> <20091002080417.GG14918@kernel.dk> <20091002092409.GA19529@elte.hu> <20091002092839.GA26962@kernel.dk> <20091002145610.GD31616@kernel.dk> From: Ray Lee Date: Fri, 2 Oct 2009 09:33:44 -0700 X-Google-Sender-Auth: 7498728d49305e08 Message-ID: <2c0942db0910020933l6d312c6ahae0e00619f598b39@mail.gmail.com> Subject: Re: IO scheduler based IO controller V10 To: Jens Axboe Cc: Linus Torvalds , Ingo Molnar , Mike Galbraith , Vivek Goyal , 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, riel@redhat.com Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 900 Lines: 17 On Fri, Oct 2, 2009 at 7:56 AM, Jens Axboe wrote: > In some cases I wish we had a server vs desktop switch, since it would > decisions on this easier. I know you say that servers care about > latency, but not at all to the extent that desktops do. Most desktop > users would gladly give away the top of the performance for latency, > that's not true of most server users. Depends on what the server does, > of course. If most of the I/O on a system exhibits seeky tendencies, couldn't the schedulers notice that and use that as the hint for what to optimize? I mean, there's no switch better than the actual I/O behavior itself. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/