From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S266995AbUBMNN1 (ORCPT ); Fri, 13 Feb 2004 08:13:27 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S266998AbUBMNN1 (ORCPT ); Fri, 13 Feb 2004 08:13:27 -0500 Received: from zork.zork.net ([64.81.246.102]:44166 "EHLO zork.zork.net") by vger.kernel.org with ESMTP id S266995AbUBMNNM (ORCPT ); Fri, 13 Feb 2004 08:13:12 -0500 To: Nagy Tibor Cc: xela@slit.de, mochel@osdl.org, bmoyle@mvista.com, orc@pell.chi.il.us, linux-kernel@vger.kernel.org Subject: Re: HIGHMEM References: <402CC114.8080100@dell633.otpefo.com> From: Sean Neakums Mail-Followup-To: Nagy Tibor , xela@slit.de, mochel@osdl.org, bmoyle@mvista.com, orc@pell.chi.il.us, linux-kernel@vger.kernel.org Date: Fri, 13 Feb 2004 13:12:48 +0000 In-Reply-To: <402CC114.8080100@dell633.otpefo.com> (Nagy Tibor's message of "Fri, 13 Feb 2004 13:20:36 +0100") Message-ID: <6uvfmbktrj.fsf@zork.zork.net> User-Agent: Gnus/5.110002 (No Gnus v0.2) Emacs/21.3 (gnu/linux) 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 Nagy Tibor writes: > Hi, > > I am sorry, I have found your e-mail address in > ./arch/i386/kernel/setup.c. I have the problem below since a year, and > there is no solution yet. I guess, the problem is about e820. The > problem exists in 2.4.x and also in 2.6.1. > > We have two Dell Poweredge servers, an older one (PowerEdge 6300) and a > newer one (PowerEdge 6400). Both servers have 4GB RAM, but the Linux > kernel uses about 500MB less memory in the newer machine. I may be talking through my hat, but I think that in this case you need to select the option for support of 64G highmem. If I recall, "4G highmem" refers not to the total amount to the memory, but to the highest physical address that can be accessed.