Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932558AbWAJUXO (ORCPT ); Tue, 10 Jan 2006 15:23:14 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932557AbWAJUXN (ORCPT ); Tue, 10 Jan 2006 15:23:13 -0500 Received: from Mail.MNSU.EDU ([134.29.1.12]:30951 "EHLO mail.mnsu.edu") by vger.kernel.org with ESMTP id S932558AbWAJUXN (ORCPT ); Tue, 10 Jan 2006 15:23:13 -0500 Message-ID: <43C417A5.6070104@mnsu.edu> Date: Tue, 10 Jan 2006 14:23:01 -0600 From: Jeffrey Hundstad User-Agent: Debian Thunderbird 1.0.7 (X11/20051017) X-Accept-Language: en-us, en MIME-Version: 1.0 To: Jesper Juhl CC: Andi Kleen , linux-kernel@vger.kernel.org Subject: 64-bit vs 32-bit userspace/kernel benchmark? Was: Athlon 64 X2 cpuinfo oddities References: <9a8748490601091218m1ff0607h79207cfafe630864@mail.gmail.com> <9a8748490601091812x24aefae3oc0c6750c5321c3ab@mail.gmail.com> <200601100336.31677.ak@suse.de> <9a8748490601100129h2ce343f5kc9bc22885f01831a@mail.gmail.com> In-Reply-To: <9a8748490601100129h2ce343f5kc9bc22885f01831a@mail.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 Content-Length: 1581 Lines: 47 Jesper Juhl wrote: >On 1/10/06, Andi Kleen wrote: > > >>On Tuesday 10 January 2006 03:12, Jesper Juhl wrote: >> >> ... >>Ah - how legacy. >> >> >> >Yeah, but since my distro of choice is 32bit only and I don't much >feel like porting it myself or using an unofficial port (slamd64) I'm >sticking with a 32bit userspace. And as long as userspace is pure >32bit there doesn't seem to be much point in building a 64bit kernel. >And I only have 2GB of RAM, so I don't have a use for the larger 64bit >address space. >I also don't run any apps that do a lot of math on >32bit numbers, so >there's not much gain there either. >I guess I would bennefit from the extra GPR's, but then I would at the >same time loose a bit by all pointers being 64bit - both lose some >disk space due to larger binaries and I'd have increased memory use >and less efficient L1/L2 cache use. > >I don't think there would actually be much gain for me in switching to >a 64bit kernel with a 64bit userspace atm. >But if I'm wrong I'd of course love to hear about it :) > > > Has anyone done any actual benchmark tests that show 64-bit vs 32-bit environments/distributions with Athlon64 processors. If so, I love to see the results. I too elected to stick with 32-bit, using the same reasoning/guessing above. -- Jeffrey Hundstad - 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/