Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264246AbUJNOAk (ORCPT ); Thu, 14 Oct 2004 10:00:40 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264726AbUJNOAk (ORCPT ); Thu, 14 Oct 2004 10:00:40 -0400 Received: from s0003.shadowconnect.net ([213.239.201.226]:36802 "EHLO mail.shadowconnect.com") by vger.kernel.org with ESMTP id S264246AbUJNOAh (ORCPT ); Thu, 14 Oct 2004 10:00:37 -0400 Message-ID: <416E8779.3020303@shadowconnect.com> Date: Thu, 14 Oct 2004 16:04:41 +0200 From: Markus Lidel User-Agent: Mozilla Thunderbird 0.6 (Windows/20040502) X-Accept-Language: en-us, en MIME-Version: 1.0 To: "Eric W. Biederman" CC: Andi Kleen , linux-kernel@vger.kernel.org Subject: Re: question about MTRR areas on x86_64 References: <2M5w2-y8-3@gated-at.bofh.it> In-Reply-To: Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1569 Lines: 53 Hello, Eric W. Biederman wrote: > Andi Kleen writes: >>Markus Lidel writes: >>>Could it be because the machine has too much memory, or is there a bug in the >>I2O driver? >> >>The problem comes from the BIOS who set up reg00 to be overlapping >>over other areas. The Linux MTRR driver cannot deal with overlapping >>MTRRs, in fact it is sometimes impossible because it could run >>out of registers or violate some of the MTRR restrictions. Sorry, for not answering, but somehow i never received your e-mail. :-( > And the BIOS is using overlapping MTRRs because otherwise it would run > out. Okay... >>It's a long standing problem, eventual fix will be to get rid >>of MTRRs completely and only use PAT. But it needs a bit more work. I've seen there is already a patch around to add initial PAT support. So i think it's only a question of time until it is included :-D If there is something i could help with please let me know. Thanks to both of you for helping. Best regards, Markus Lidel ------------------------------------------ Markus Lidel (Senior IT Consultant) Shadow Connect GmbH Carl-Reisch-Weg 12 D-86381 Krumbach Germany Phone: +49 82 82/99 51-0 Fax: +49 82 82/99 51-11 E-Mail: Markus.Lidel@shadowconnect.com URL: http://www.shadowconnect.com - 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/