Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1423846AbWKIOyN (ORCPT ); Thu, 9 Nov 2006 09:54:13 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1423854AbWKIOyN (ORCPT ); Thu, 9 Nov 2006 09:54:13 -0500 Received: from pentafluge.infradead.org ([213.146.154.40]:11465 "EHLO pentafluge.infradead.org") by vger.kernel.org with ESMTP id S1423846AbWKIOyM (ORCPT ); Thu, 9 Nov 2006 09:54:12 -0500 Subject: Re: Abysmal PATA IDE performance From: Arjan van de Ven To: Stephen.Clark@seclark.us Cc: "\"\\\"J.A.\\\"" =?ISO-8859-1?Q?Magall=F3n=22?= , =?ISO-8859-1?Q?Bj=F6rn?= Steinbrink , Mark Lord , linux-kernel , alan@lxorguk.ukuu.org.uk In-Reply-To: <45533DB9.4000405@seclark.us> References: <455206E7.2050104@seclark.us> <45526D50.5020105@rtr.ca> <455277E1.3040803@seclark.us> <20061109020758.GA21537@atjola.homenet> <4552A638.4010207@seclark.us> <20061109094014.1c8b6bed@werewolf-wl> <1163062700.3138.467.camel@laptopd505.fenrus.org> <45533DB9.4000405@seclark.us> Content-Type: text/plain Organization: Intel International BV Date: Thu, 09 Nov 2006 15:54:05 +0100 Message-Id: <1163084045.3138.502.camel@laptopd505.fenrus.org> Mime-Version: 1.0 X-Mailer: Evolution 2.8.1.1 (2.8.1.1-3.fc6) 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 Content-Length: 1159 Lines: 34 > > > > > > > Thanks all. > > Arjan, using combined_mode=libata and making a new ramdisk increased my > xfer rate from 1.xx mb/sec to 28.xx mb/sec. > ok that's getting somewhere > I am curious as to why my friends dell inspiron 8200 with a 1.8ghz p4 > and the same drive using the same drive with FC6 and the standard ide > module gets 44 to 45 mb/sec. now it is going to come down to how you measure this.... don't use hdparm, use something like tiobench (tiobench.sf.net); another setting that might be different is that scsi normally turns the write back cache off (safer for your data but slower) while IDE normally leaves at at factory default (on for cheating on benchmarks). For writes, this can easily explain the difference... -- if you want to mail me at work (you don't), use arjan (at) linux.intel.com Test the interaction between Linux and your BIOS via http://www.linuxfirmwarekit.org - 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/