Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758264AbXFZPD6 (ORCPT ); Tue, 26 Jun 2007 11:03:58 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756589AbXFZPDu (ORCPT ); Tue, 26 Jun 2007 11:03:50 -0400 Received: from one.firstfloor.org ([213.235.205.2]:42061 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755903AbXFZPDt (ORCPT ); Tue, 26 Jun 2007 11:03:49 -0400 Date: Tue, 26 Jun 2007 17:03:48 +0200 From: Andi Kleen To: Jesse Barnes Cc: "Eric W. Biederman" , Jesse Barnes , Andi Kleen , linux-kernel@vger.kernel.org, akpm@linux-foundation.org, Justin Piszcz , Yinghai Lu Subject: Re: [PATCH] trim memory not covered by WB MTRRs Message-ID: <20070626150348.GB7877@one.firstfloor.org> References: <200706251434.43863.jesse.barnes@intel.com> <200706252029.35574.jbarnes@virtuousgeek.org> <200706252030.52611.jbarnes@virtuousgeek.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <200706252030.52611.jbarnes@virtuousgeek.org> User-Agent: Mutt/1.4.2.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 637 Lines: 14 On Mon, Jun 25, 2007 at 08:30:52PM -0700, Jesse Barnes wrote: > Oh, and FYI I've seen new systems with a default mapping type of WB, with a > few uncached holes for MMIO. That means PAT will be absolutely required on > those systems if we want to use WC for the framebuffer or other memory. Why? As long as there are still MTRRs free you could use them for WC even in this setup. -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/