From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261206AbVGTNbk (ORCPT ); Wed, 20 Jul 2005 09:31:40 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261210AbVGTNbk (ORCPT ); Wed, 20 Jul 2005 09:31:40 -0400 Received: from nproxy.gmail.com ([64.233.182.195]:43668 "EHLO nproxy.gmail.com") by vger.kernel.org with ESMTP id S261206AbVGTNbj convert rfc822-to-8bit (ORCPT ); Wed, 20 Jul 2005 09:31:39 -0400 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:reply-to:to:subject:cc:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=Jq/o66wsedSdDRud3Ups79ikqm5zVKitdzJMrigc1eRC1PYuInNNsK1zaEj6lOp82m4+SpIHgHfaJaS4jkjRWHZlPi4HqijSFTam1Y36PJXo2uV5z4963C1H7N5oZGJKlHQAzOpAD0C2i/p8fEDjZE9WzSPs1ueCdPvp+jHwQbY= Message-ID: <69304d110507200631564a73b1@mail.gmail.com> Date: Wed, 20 Jul 2005 15:31:36 +0200 From: Antonio Vargas Reply-To: Antonio Vargas To: Erik Mouw Subject: Re: a 15 GB file on tmpfs Cc: Bastiaan Naber , linux-kernel@vger.kernel.org In-Reply-To: <20050720132006.GI7050@harddisk-recovery.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT Content-Disposition: inline References: <200507201416.36155.naber@inl.nl> <20050720132006.GI7050@harddisk-recovery.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On 7/20/05, Erik Mouw wrote: > 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 > - Bastian, Erik is dead-on on that one: go 64bit and forget all worries about your 15GB filesize. Just don't forget to look not only x86-64 (intel or amd) but also itanium, ppc64 and s390 machines, you never know about surprises! -- Greetz, Antonio Vargas aka winden of network http://wind.codepixel.com/ Las cosas no son lo que parecen, excepto cuando parecen lo que si son.