From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932389AbZDAOZx (ORCPT ); Wed, 1 Apr 2009 10:25:53 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1765852AbZDAOZn (ORCPT ); Wed, 1 Apr 2009 10:25:43 -0400 Received: from smtp2.it.da.ut.ee ([193.40.5.67]:49487 "EHLO smtp2.it.da.ut.ee" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758225AbZDAOZm (ORCPT ); Wed, 1 Apr 2009 10:25:42 -0400 Date: Wed, 1 Apr 2009 17:25:40 +0300 (EEST) From: Meelis Roos To: Linux Kernel list Subject: Re: strange MTRR on 2.6.29-git In-Reply-To: Message-ID: References: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > Found this on todays 2.6.29 + git. The same address range has both WB > and UC MTRR-s. > > reg00: base=0x000000000 ( 0MB), size= 512MB, count=1: write-back > reg01: base=0x020000000 ( 512MB), size= 1MB, count=1: write-back > reg02: base=0x020000000 ( 512MB), size= 1MB, count=1: uncachable > reg03: base=0x0f2000000 ( 3872MB), size= 32MB, count=2: write-combining > reg04: base=0x0f8000000 ( 3968MB), size= 64MB, count=1: write-combining Actually, these double MTRR-s for the range @ 512M are there long time. Testbooted 2.6.20 that is the earliest kernel I have around here and this conflicting double MTRR is still there, so it's not a recent change. In 2.6.20 reg04 was not present but that's probably unimportant since reg01 and reg02 are the same. -- Meelis Roos (mroos@linux.ee)