Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932244AbVL0QLy (ORCPT ); Tue, 27 Dec 2005 11:11:54 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932250AbVL0QLx (ORCPT ); Tue, 27 Dec 2005 11:11:53 -0500 Received: from mtl.rackplans.net ([65.39.167.249]:40922 "HELO innerfire.net") by vger.kernel.org with SMTP id S932244AbVL0QLx (ORCPT ); Tue, 27 Dec 2005 11:11:53 -0500 Date: Tue, 27 Dec 2005 11:11:41 -0500 (EST) From: Gerhard Mack To: Nauman Tahir cc: Arjan van de Ven , linux-kernel@vger.kernel.org Subject: Re: ia_64_bit Performance difference In-Reply-To: Message-ID: References: <1135669831.2926.11.camel@laptopd505.fenrus.org> 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: 1746 Lines: 48 On Tue, 27 Dec 2005, Nauman Tahir wrote: > On 12/27/05, Arjan van de Ven wrote: > > On Tue, 2005-12-27 at 12:18 +0500, Nauman Tahir wrote: > > > Hi all, > > > I have written a block device driver. Driver includes the > > > implementation of write back cache policy. Purpose of the driver is > > > not an issue. The problem I am facing is the considerable difference > > > of performance when I run same driver on 32 and 64 BIT OS. I am > > > testing the driver on 64 Bit Machine and run the same driver on both > > > (32 and 64 Bit) OS. On 32 Bit, IO rate is almost double then on 64 Bit > > > OS. ( i wish it could have been opposite :( ) > > > > you forgot to post the URL to your source code... > > I did NOT FORGET to post the URL of my code as I mentioned I am > interested in general > areas of the kernel to look for. Like is there any problem related to > 64 bit specific kernel compilation etc... > > You should ask for my system configurations. As far as the code is > concered there is not any architecture specific issue I guess in that. > I have used threads of MD as my generic thread library and have used > calculations based on unsigned long. > > Kernel Version: > I am using is 2.6.9 and onwards. > > Machine configuration is : > HP Prolient DL 145 (Dual Opteron 244 Processors with 14GB RAM) Opteron is not ia_64 it's X86_64. ia_64 is Itanuim. Gerhard -- Gerhard Mack gmack@innerfire.net <>< As a computer I find your faith in technology amusing. - 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/