Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261695AbVBOMIG (ORCPT ); Tue, 15 Feb 2005 07:08:06 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261697AbVBOMIG (ORCPT ); Tue, 15 Feb 2005 07:08:06 -0500 Received: from colin2.muc.de ([193.149.48.15]:27401 "HELO colin2.muc.de") by vger.kernel.org with SMTP id S261695AbVBOMIB (ORCPT ); Tue, 15 Feb 2005 07:08:01 -0500 Date: 15 Feb 2005 13:08:00 +0100 Date: Tue, 15 Feb 2005 13:08:00 +0100 From: Andi Kleen To: YhLu Cc: linux-kernel@vger.kernel.org Subject: Re: X86_64 kernel support MAX memory. Message-ID: <20050215120800.GA25815@muc.de> References: <3174569B9743D511922F00A0C943142308085800@TYANWEB> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3174569B9743D511922F00A0C943142308085800@TYANWEB> User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 617 Lines: 17 On Mon, Feb 14, 2005 at 07:32:42PM -0800, YhLu wrote: > Andi, > > How much is max RAM 2.6.11 x86_64 support on AMD64? > 64G or 128G? 46bits in theory (64TB), however current CPUs only support upto 40bits (AMD) or 36bits (Intel). There is some other code that is also limited to 40bits right now like AGP or IOMMU or MTRR, that is all due to hardware limitations. -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/