Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932674AbVJ0WMI (ORCPT ); Thu, 27 Oct 2005 18:12:08 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932679AbVJ0WMI (ORCPT ); Thu, 27 Oct 2005 18:12:08 -0400 Received: from ns2.suse.de ([195.135.220.15]:60577 "EHLO mx2.suse.de") by vger.kernel.org with ESMTP id S932673AbVJ0WMG (ORCPT ); Thu, 27 Oct 2005 18:12:06 -0400 To: Roland Dreier Cc: linux-kernel@vger.kernel.org, marcel@holtmann.org Subject: Re: 4GB memory and Intel Dual-Core system References: <1130445194.5416.3.camel@blade> <52mzkuwuzg.fsf@cisco.com> From: Andi Kleen Date: 28 Oct 2005 00:12:04 +0200 In-Reply-To: <52mzkuwuzg.fsf@cisco.com> Message-ID: User-Agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.3 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 Content-Length: 661 Lines: 11 Roland Dreier writes: > > I don't know if EM64T systems (or whatever the right term is) have a > way of remapping some RAM above 4 GB so that you can use all your > memory in a case like this. The lower/middle end non server intel chipsets typically only support 4GB of physical address space in hardware. No memory remapping possible. So with 4GB RAM you always lose to the memory hole. -Andi - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/