From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752577AbYJ0Aet (ORCPT ); Sun, 26 Oct 2008 20:34:49 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751321AbYJ0Ael (ORCPT ); Sun, 26 Oct 2008 20:34:41 -0400 Received: from casper.infradead.org ([85.118.1.10]:35102 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751153AbYJ0Aek (ORCPT ); Sun, 26 Oct 2008 20:34:40 -0400 Date: Sun, 26 Oct 2008 17:34:58 -0700 From: Arjan van de Ven To: "H. Peter Anvin" Cc: "Diego M. Vadell" , Linux Kernel Subject: Re: PAT and MTRRs Message-ID: <20081026173458.44c5a036@infradead.org> In-Reply-To: <49050995.4080508@zytor.com> References: <200810262246.21807.dvadell@linuxclusters.com.ar> <20081026171210.7b3b096a@infradead.org> <49050995.4080508@zytor.com> Organization: Intel X-Mailer: Claws Mail 3.5.0 (GTK+ 2.12.12; i386-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, 26 Oct 2008 17:21:41 -0700 "H. Peter Anvin" wrote: > Arjan van de Ven wrote: > > > > PAT can't make memory cachable that the MTRR's have as uncachable. > > What PAT *can* do is, within an MTRR, do fine grained mapping... > > > > Now, if it wasn't for the braindamage called ACPI and SMM, we could > have cleared the MTRR settings and just used PAT... > yeah.. one thing we need to investigate is if we can set the default "no mtrr coverage" value to cached (and also.. to check we don't set that to uncached if the bios had it set to cached..) -- Arjan van de Ven Intel Open Source Technology Centre For development, discussion and tips for ape savings, visit http://www.lesswatts.org