Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754748AbXAAXbH (ORCPT ); Mon, 1 Jan 2007 18:31:07 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754771AbXAAXbH (ORCPT ); Mon, 1 Jan 2007 18:31:07 -0500 Received: from smtp.osdl.org ([65.172.181.25]:46363 "EHLO smtp.osdl.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754748AbXAAXbG (ORCPT ); Mon, 1 Jan 2007 18:31:06 -0500 Date: Mon, 1 Jan 2007 15:30:57 -0800 (PST) From: Linus Torvalds To: Rene Herman , Jens Axboe cc: Tejun Heo , Alan Cox , Linux Kernel Mailing List Subject: Re: 2.6.20-rc2+: CFQ halving disk throughput. In-Reply-To: <45999191.8020004@gmail.com> Message-ID: References: <45893CAD.9050909@gmail.com> <45921E73.1080601@gmail.com> <4592B25A.4040906@gmail.com> <45932AF1.9040900@gmail.com> <45998F62.6010904@gmail.com> <45999191.8020004@gmail.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 858 Lines: 27 On Mon, 1 Jan 2007, Rene Herman wrote: > Rene Herman wrote: > > > In fact, it's CFQ. The PATA thing was a red herring. 2.6.20-rc2 and 3 give > > me ~ 24 MB/s from "hdparm t /dev/hda" while 2.6.20-rc1 and below give me ~ > > 50 MB/s. > > > > Jens: this is due to "[PATCH] cfq-iosched: tighten allow merge criteria", > > 719d34027e1a186e46a3952e8a24bf91ecc33837: > > axboe@oracle.com bounces for me. Could one of the other recipients of parent > message try to forward? It should be "Jens Axboe ". Jens was away over the holidays, hopefully he'll be back today or tomorrow. Linus - 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/