From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760262AbYEHHgb (ORCPT ); Thu, 8 May 2008 03:36:31 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752153AbYEHHgV (ORCPT ); Thu, 8 May 2008 03:36:21 -0400 Received: from smtp-OUT05A.alice.it ([85.33.3.5]:4756 "EHLO smtp-OUT05A.alice.it" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751128AbYEHHgU (ORCPT ); Thu, 8 May 2008 03:36:20 -0400 From: Fabio De Francesco To: Rene Herman Subject: Re: [x86_32] With 4GB installed, in which cases low mem total is less than 896MB? Date: Thu, 8 May 2008 09:48:17 +0200 User-Agent: KMail/1.9.9 References: <200804301702.06019.fabiomdf@alice.it> <481DCA14.9030302@keyaccess.nl> In-Reply-To: <481DCA14.9030302@keyaccess.nl> Cc: linux-kernel@vger.kernel.org MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-15" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200805080948.19914.fabiomdf@alice.it> X-OriginalArrivalTime: 08 May 2008 07:34:58.0453 (UTC) FILETIME=[047C1C50:01C8B0DE] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sunday 04 May 2008 16:37:08 you wrote: >On 30-04-08 17:02, Fabio De Francesco wrote: > >> I've got a Linux box, Intel Core 2 T7700 with 4GB RAM installed, with >> vanilla kernel 2.6.24 + TuxOnIce patch-set compiled for x86_32bit >> (CONFIG_X86_32=y), whose /proc/meminfo shows "LowTotal 794MB". >> >> I've always known that, in this specific platform, Linux permanently maps >> 896MB as "Low Memory" into its linear address space (as this last value >> is the one /proc/meminfo shows in the other two x86_32bit computers I >> own). > >Others have already answered as well so this just as by the way and just in >case... why are you running a 32-bit kernel on it? > >Rene. > Hello Rene, It's only because when I got the box I had to make it run as soon as possible, sooner than I'd had time to investigate which possible benefits I would have had from running a 64bit distribution. Further, since I had to install a Gentoo GNU/Linux distribution by "emerging" from a chroot(-ed) environment inside an Ubuntu 32bit one (it takes too long to explain why), I supposed I couldn't do that for installing a 64bit Gentoo. Still today I don't know whether or not I assumed that wrongly. Today I would switch to a 64bit Gentoo but, first I don't know how to do that in a secure and fast way, second I still don't know if it is worth the job... Could you please summarize which benefits I would gain from that? -- Best Regards, fabio de francesco metanix.org