From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sun, 1 Dec 2002 20:01:13 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sun, 1 Dec 2002 20:01:13 -0500 Received: from supreme.pcug.org.au ([203.10.76.34]:51693 "EHLO pcug.org.au") by vger.kernel.org with ESMTP id ; Sun, 1 Dec 2002 20:01:13 -0500 Date: Mon, 2 Dec 2002 12:08:35 +1100 From: Stephen Rothwell To: LKML Subject: Maximum Physical Memory on 2.4 and ia32 Message-Id: <20021202120835.4ecb87fd.sfr@canb.auug.org.au> X-Mailer: Sylpheed version 0.8.6 (GTK+ 1.2.10; i386-debian-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hi all, This may be a FAQ (but I did search). Given this statement by RedHat: "RAM Limitations on IA32 Red Hat Linux releases based on the 2.4 kernel -- including Red Hat Linux 7.1, 7.2, 7.3 and Red Hat Linux Advanced Server 2.1 -- support a maximum of 16GB of RAM. Previous product announcements from Red Hat suggested that Red Hat Linux 7.1 (and by extension, other releases based on the 2.4 kernel) supported up to 64GB of RAM. A more accurate statement is the 2.4-based kernels included in Red Hat Linux 7.1, 7.2, 7.3 and Red Hat Linux Advanced Server 2.1 support the hardware extensions that support up to 64GB of RAM. This is an important distinction: while the hardware will indeed support up to 64GB of physical memory, the operating system design limits the supported physical memory to approximately 16GB." (http://www.redhat.com/services/techsupport/production/GSS_caveat.html) What are the "operating system design limits" that restrict the amount of supported memory to 16GB? -- Cheers, Stephen Rothwell sfr@canb.auug.org.au http://www.canb.auug.org.au/~sfr/