From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760389AbXFAVmW (ORCPT ); Fri, 1 Jun 2007 17:42:22 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1761172AbXFAVmL (ORCPT ); Fri, 1 Jun 2007 17:42:11 -0400 Received: from outbound-mail-03.bluehost.com ([69.89.21.13]:44174 "HELO outbound-mail-03.bluehost.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1761154AbXFAVmJ (ORCPT ); Fri, 1 Jun 2007 17:42:09 -0400 From: Jesse Barnes To: Andi Kleen Subject: Re: Intel's response Linux/MTRR/8GB Memory Support / Why doesn't the kernel realize the BIOS has problems and re-map appropriately? Date: Fri, 1 Jun 2007 14:41:57 -0700 User-Agent: KMail/1.9.6 Cc: Justin Piszcz , linux-kernel@vger.kernel.org References: <200706011407.51779.jbarnes@virtuousgeek.org> <20070601211943.GO7217@one.firstfloor.org> In-Reply-To: <20070601211943.GO7217@one.firstfloor.org> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200706011441.57149.jbarnes@virtuousgeek.org> X-Identified-User: {642:box128.bluehost.com:virtuous:virtuousgeek.org} {sentby:smtp auth 76.102.120.196 authed with jbarnes@virtuousgeek.org} Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Friday, June 1, 2007 2:19:43 Andi Kleen wrote: > And normally the MTRRs win, don't they (if I remember the table correctly) > So if the MTRR says UC and PAT disagrees it might not actually help I just checked, yes the MTRRs win for UC types. But it sounds like the cases we're talking about are actually situations where there's no MTRR coverage, so the default type is used. The manual doesn't specifically call out how memory using the default type interacts with PAT, but it may well be that it stays uncached if the default type is uncached. Again that argues for fixing the MTRR mapping problem in some way. Thanks, Jesse