From mboxrd@z Thu Jan 1 00:00:00 1970 From: Grant Coady Subject: Re: [git patches] IDE update Date: Fri, 08 Jul 2005 10:06:43 +1000 Message-ID: References: <42C9C56D.7040701@tomt.net> <42CA5A84.1060005@rainbow-software.org> <20050705101414.GB18504@suse.de> <42CA5EAD.7070005@rainbow-software.org> <20050705104208.GA20620@suse.de> <42CA7EA9.1010409@rainbow-software.org> <1120567900.12942.8.camel@linux> <42CA84DB.2050506@rainbow-software.org> <1120569095.12942.11.camel@linux> <42CAAC7D.2050604@rainbow-software.org> <20050705142122.GY1444@suse.de> <6m8mc1lhug5d345uqikru1vpsqi6hciv41@4ax.com> <42CDAD94.7000306@rtr.ca> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Return-path: Received: from [202.136.32.45] ([202.136.32.45]:2277 "EHLO relay02.mail-hub.dodo.com.au") by vger.kernel.org with ESMTP id S262335AbVGHAHp (ORCPT ); Thu, 7 Jul 2005 20:07:45 -0400 In-Reply-To: <42CDAD94.7000306@rtr.ca> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Mark Lord Cc: Jens Axboe , Ondrej Zary , =?ISO-8859-1?Q?=20Andr=E9?= Tomt , Al Boldi , 'Bartlomiej Zolnierkiewicz' , 'Linus Torvalds' , linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org On Thu, 07 Jul 2005 18:32:52 -0400, Mark Lord wrote: > >hdparm can also use O_DIRECT for the -t timing test. I've not been able to get dual channel I/O speed faster than single interface speed, either as 'md' RAID0 or simultaneous reading or writing done the other day: Time to write or read 500MB file: >summary 2.4.31-hf1 2.6.12.2 >boxen \ time -> w r w r >--------------- ---- ---- ---- ---- ... >peetoo 33 20 26.5 22 >(simultaneuous 57 37.5 52 38.5) MB/s 2.4.31-hf1 2.6.12.2 w r w r single 15 25 19 23 dual 17.5 27 19 26 These timings show very little happening in parallel, is that normal? Thanks, --Grant.