Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1160997AbWJRMou (ORCPT ); Wed, 18 Oct 2006 08:44:50 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1160998AbWJRMou (ORCPT ); Wed, 18 Oct 2006 08:44:50 -0400 Received: from unthought.net ([212.97.129.88]:10501 "EHLO unthought.net") by vger.kernel.org with ESMTP id S1160997AbWJRMot (ORCPT ); Wed, 18 Oct 2006 08:44:49 -0400 Date: Wed, 18 Oct 2006 14:44:50 +0200 From: Jakob Oestergaard To: Alan Cox Cc: Jens Axboe , Arjan van de Ven , "Phetteplace, Thad (GE Healthcare, consultant)" , linux-kernel@vger.kernel.org Subject: Re: Bandwidth Allocations under CFQ I/O Scheduler Message-ID: <20061018124450.GX23492@unthought.net> Mail-Followup-To: Jakob Oestergaard , Alan Cox , Jens Axboe , Arjan van de Ven , "Phetteplace, Thad (GE Healthcare, consultant)" , linux-kernel@vger.kernel.org References: <1161048269.3245.26.camel@laptopd505.fenrus.org> <20061017132312.GD7854@kernel.dk> <20061018080030.GU23492@unthought.net> <1161164456.3128.81.camel@laptopd505.fenrus.org> <20061018113001.GV23492@unthought.net> <20061018114913.GG24452@kernel.dk> <20061018122323.GW23492@unthought.net> <1161175344.9363.30.camel@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1161175344.9363.30.camel@localhost.localdomain> User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 966 Lines: 27 On Wed, Oct 18, 2006 at 01:42:24PM +0100, Alan Cox wrote: > Ar Mer, 2006-10-18 am 14:23 +0200, ysgrifennodd Jakob Oestergaard: > > iops/sec is what you get from your disks. In real world scenarios. It's > > no more magic than the real world, and no harder to understand than real > > world disks. Although I admit real-world disks can be a bitch at times ;) > > Even iops/sec is very vague and arbitary. If your disk happens to be > retrying a sector or doing a cleaning pass or any other housekeeping or > vibration damping and so on you'll get very different numbers. True. > > Bandwidth is completely silly in this context, iops/sec is merely > hopeless 8) Thanks Alan - I feel much better now :) -- / jakob - 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/