From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261203AbVGTNUK (ORCPT ); Wed, 20 Jul 2005 09:20:10 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261206AbVGTNUK (ORCPT ); Wed, 20 Jul 2005 09:20:10 -0400 Received: from dtp.xs4all.nl ([80.126.206.180]:9791 "HELO abra2.bitwizard.nl") by vger.kernel.org with SMTP id S261203AbVGTNUI (ORCPT ); Wed, 20 Jul 2005 09:20:08 -0400 Date: Wed, 20 Jul 2005 15:20:07 +0200 From: Erik Mouw To: Bastiaan Naber Cc: linux-kernel@vger.kernel.org Subject: Re: a 15 GB file on tmpfs Message-ID: <20050720132006.GI7050@harddisk-recovery.com> References: <200507201416.36155.naber@inl.nl> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200507201416.36155.naber@inl.nl> Organization: Harddisk-recovery.com User-Agent: Mutt/1.5.9i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jul 20, 2005 at 02:16:36PM +0200, Bastiaan Naber wrote: > I have a 15 GB file which I want to place in memory via tmpfs. I want to do > this because I need to have this data accessible with a very low seek time. That should be no problem on a 64 bit architecture. > I want to know if this is possible before spending 10,000 euros on a machine > that has 16 GB of memory. If you want to spend that amount of money on memory anyway, the extra cost for an AMD64 machine isn't that large. > The machine we plan to buy is a HP Proliant Xeon machine and I want to run a > 32 bit linux kernel on it (the xeon we want doesn't have the 64-bit stuff > yet) AFAIK you can't use a 15 GB tmpfs on i386 because large memory support is basically a hack to support multiple 4GB memory spaces (some VM guru correct me if I'm wrong). Just get an Athlon64 machine and run a 64 bit kernel on it. If compatibility is a problem, you can still run a 32 bit i386 userland on an x86_64 kernel. Erik -- +-- Erik Mouw -- www.harddisk-recovery.com -- +31 70 370 12 90 -- | Lab address: Delftechpark 26, 2628 XH, Delft, The Netherlands