From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756272AbXGILSy (ORCPT ); Mon, 9 Jul 2007 07:18:54 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751835AbXGILSn (ORCPT ); Mon, 9 Jul 2007 07:18:43 -0400 Received: from mail.tmr.com ([64.65.253.246]:34742 "EHLO gaimboi.tmr.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751801AbXGILSm (ORCPT ); Mon, 9 Jul 2007 07:18:42 -0400 Message-ID: <468D6C95.4070008@tmr.com> Date: Thu, 05 Jul 2007 18:11:33 -0400 From: Bill Davidsen User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.8.0.8) Gecko/20061105 SeaMonkey/1.0.6 MIME-Version: 1.0 To: Gene Heskett CC: linux-kernel@vger.kernel.org Subject: Re: speed trends in pata world. References: <200707041550.22533.gene.heskett@gmail.com> In-Reply-To: <200707041550.22533.gene.heskett@gmail.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Gene Heskett wrote: > Greetings; > > The drive speeds seem to be going the wrong way. Its an nforce2 equipt mobo, > and I have 3 drives currently in this box. Running 2.6.22-rc6-cfs-v18 + the > ftdi_sio.c patch. > > hda, the primary on cable 0, is running at around 28MB/Sec. Its a 200GB WD > about 2 years old. > > hdb, is running at around 79MB/Sec, its a 4 year old 120GB WD. > hdd is running at about 75MB/Sec, is a nearly new 300GB WD. > > Can I read anything into the fact that the 2 fast drives are on the slave end > of the cables, whereas the slow one is master in the middle of the cable? > First look at dmesg and see what it tells you. Second, if there is a slow device on the cable it will sometimes limit the speed of the disk. Alan Cox and God might know why, I don't. Third, you can play with drive parameters with hdparm. *DANGEROUS* to do so, the man page says "needless and risky," but at least the older kernels truly sucked at guessing the correct speeds. Backups are advised if you do this, etc,etc. -- Bill Davidsen "We have more to fear from the bungling of the incompetent than from the machinations of the wicked." - from Slashdot