Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756714AbXITGue (ORCPT ); Thu, 20 Sep 2007 02:50:34 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750924AbXITGu0 (ORCPT ); Thu, 20 Sep 2007 02:50:26 -0400 Received: from cantor2.suse.de ([195.135.220.15]:56128 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750719AbXITGu0 (ORCPT ); Thu, 20 Sep 2007 02:50:26 -0400 To: Jesse Barnes Cc: Howard Chu , linux-kernel Subject: Re: MTRR initialization References: <46EAB7DA.10507@symas.com> <200709191452.57505.jesse.barnes@intel.com> From: Andi Kleen Date: 20 Sep 2007 08:50:23 +0200 In-Reply-To: <200709191452.57505.jesse.barnes@intel.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: 675 Lines: 11 Jesse Barnes writes: > > To do this in a nicer way (and be less vulnerable to similar BIOS > funkiness) the kernel really needs full PAT support. That should allow > WC over WB and WC over UC mappings to occur, at least if I'm > remembering the docs right... PAT only really helps for device driver performance optimizations. But if the basic WB MTRRs are wrong PAT cannot really salvage it. -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/