Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758077AbZJBSdU (ORCPT ); Fri, 2 Oct 2009 14:33:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758012AbZJBSdT (ORCPT ); Fri, 2 Oct 2009 14:33:19 -0400 Received: from mail.gmx.net ([213.165.64.20]:48327 "HELO mail.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1757895AbZJBSdS (ORCPT ); Fri, 2 Oct 2009 14:33:18 -0400 X-Authenticated: #14349625 X-Provags-ID: V01U2FsdGVkX1/Yr3YpxKbYg7xnMfy+YMxWk4CN2jqNEUq5wgiS4b BfsVcnD4i0jc0g Subject: Re: IO scheduler based IO controller V10 From: Mike Galbraith To: Jens Axboe Cc: Ingo Molnar , Linus Torvalds , 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 In-Reply-To: <20091002182608.GO31616@kernel.dk> References: <20091002145610.GD31616@kernel.dk> <20091002171129.GG31616@kernel.dk> <20091002172046.GA2376@elte.hu> <20091002172554.GJ31616@kernel.dk> <20091002172842.GA4884@elte.hu> <20091002173732.GK31616@kernel.dk> <20091002175629.GA14860@elte.hu> <20091002180437.GL31616@kernel.dk> <1254507754.8667.15.camel@marge.simson.net> <20091002182608.GO31616@kernel.dk> Content-Type: text/plain Date: Fri, 02 Oct 2009 20:33:17 +0200 Message-Id: <1254508397.8667.24.camel@marge.simson.net> Mime-Version: 1.0 X-Mailer: Evolution 2.24.1.1 Content-Transfer-Encoding: 7bit X-Y-GMX-Trusted: 0 X-FuHaFi: 0.6 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1274 Lines: 29 On Fri, 2009-10-02 at 20:26 +0200, Jens Axboe wrote: > On Fri, Oct 02 2009, Mike Galbraith wrote: > > On Fri, 2009-10-02 at 20:04 +0200, Jens Axboe wrote: > > > > > I'm not too crazy about it either. How about just using 'desktop' since > > > this is obviously what we are really targetting? 'latency' isn't fully > > > descriptive either, since it may not necessarily provide the best single > > > IO latency (noop would). > > > > Grin. "Perfect is the enemy of good" :) > > Avg > > 16.24 175.82 154.38 228.97 147.16 144.5 noop > > 43.23 57.39 96.13 148.25 180.09 105.0 deadline > > Yep, that's where it falls down. Noop basically fails here because it > treats all IO as equal, which obviously isn't true for most people. But > even for pure read workloads (is the above the mixed read/write, or just > read?), latency would be excellent with noop but the desktop experience > would not. Yeah, it's the dd vs konsole -e exit. -Mike -- 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/