From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758322AbXFUDlR (ORCPT ); Wed, 20 Jun 2007 23:41:17 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753302AbXFUDlB (ORCPT ); Wed, 20 Jun 2007 23:41:01 -0400 Received: from pentafluge.infradead.org ([213.146.154.40]:50723 "EHLO pentafluge.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753096AbXFUDlA (ORCPT ); Wed, 20 Jun 2007 23:41:00 -0400 Subject: Re: SATA Harddisk speed drop of 100 MB/s From: Arjan van de Ven To: Jeff Garzik Cc: Carlo Wood , linux-kernel@vger.kernel.org In-Reply-To: <4679B2DE.9090903@garzik.org> References: <20070620224847.GA5488@alinoe.com> <4679B2DE.9090903@garzik.org> Content-Type: text/plain Organization: Intel International BV Date: Wed, 20 Jun 2007 20:36:52 -0700 Message-Id: <1182397012.2863.0.camel@laptopd505.fenrus.org> Mime-Version: 1.0 X-Mailer: Evolution 2.10.2 (2.10.2-2.fc7) Content-Transfer-Encoding: 7bit X-SRS-Rewrite: SMTP reverse-path rewritten from by pentafluge.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 2007-06-20 at 19:06 -0400, Jeff Garzik wrote: > Carlo Wood wrote: > > hdparm -tT gives over 160 MB/s for my tripple 10k rpm Raptor RAID5 > > on 2.6.18, as expected. > > > > In 2.6.22-rc5 this dropped to only 60 MB/s ! > > > > Is this a known issue? > > > > I also measured it with bonnie; I get 108 MB/s reading speed on > > 2.6.18 and only 68 MB/s on 2.6.22-rc5. > > More info needed... kernel config, before-and-after dmesg output, lspci > output. also do a echo 60 > /proc/sys/vm/dirty_ratio first to see if that helps