Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030252AbWJRMkl (ORCPT ); Wed, 18 Oct 2006 08:40:41 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030253AbWJRMkl (ORCPT ); Wed, 18 Oct 2006 08:40:41 -0400 Received: from outpipe-village-512-1.bc.nu ([81.2.110.250]:1470 "EHLO lxorguk.ukuu.org.uk") by vger.kernel.org with ESMTP id S1030252AbWJRMkk (ORCPT ); Wed, 18 Oct 2006 08:40:40 -0400 Subject: Re: Bandwidth Allocations under CFQ I/O Scheduler From: Alan Cox To: Jakob Oestergaard Cc: Jens Axboe , Arjan van de Ven , "Phetteplace, Thad (GE Healthcare, consultant)" , linux-kernel@vger.kernel.org In-Reply-To: <20061018122323.GW23492@unthought.net> 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> Content-Type: text/plain Content-Transfer-Encoding: 7bit Date: Wed, 18 Oct 2006 13:42:24 +0100 Message-Id: <1161175344.9363.30.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.6.2 (2.6.2-1.fc5.5) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 821 Lines: 17 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. Bandwidth is completely silly in this context, iops/sec is merely hopeless 8) - 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/