Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759227AbXFDVDA (ORCPT ); Mon, 4 Jun 2007 17:03:00 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752444AbXFDVCx (ORCPT ); Mon, 4 Jun 2007 17:02:53 -0400 Received: from ebiederm.dsl.xmission.com ([166.70.28.69]:47123 "EHLO ebiederm.dsl.xmission.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750795AbXFDVCw (ORCPT ); Mon, 4 Jun 2007 17:02:52 -0400 From: ebiederm@xmission.com (Eric W. Biederman) To: Alan Cox Cc: Justin Piszcz , Jesse Barnes , Andi Kleen , linux-kernel@vger.kernel.org Subject: Re: Intel's response Linux/MTRR/8GB Memory Support / Why doesn't the kernel realize the BIOS has problems and re-map appropriately? References: <200706011407.51779.jbarnes@virtuousgeek.org> <20070601211943.GO7217@one.firstfloor.org> <200706011441.57149.jbarnes@virtuousgeek.org> <20070604201823.7b7cb328@the-village.bc.nu> Date: Mon, 04 Jun 2007 15:01:50 -0600 In-Reply-To: <20070604201823.7b7cb328@the-village.bc.nu> (Alan Cox's message of "Mon, 4 Jun 2007 20:18:23 +0100") Message-ID: User-Agent: Gnus/5.110006 (No Gnus v0.6) Emacs/21.4 (gnu/linux) 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: 965 Lines: 21 Alan Cox writes: >> Therefore, they are NOT going to fix their BIOS-- and I have already >> received an e-mail from one or two people who are experiencing this >> problem, I presume it will only get worse. > > In which case we need to clip the memory used according to the MTRR > registers and tell the user xxMB of memory not available due to BIOS bugs Exactly, and given that this is a fairly easy thing to do, and that occasionally we see systems where this happens (even if their BIOS is later fixed). It is likely worth it for someone to write up the patch and that compare MTRRs with available memory, and to complain and reserve all memory that MTRRs claim is not write-back. Eric - 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/