Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262477AbUJ0Pqk (ORCPT ); Wed, 27 Oct 2004 11:46:40 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262492AbUJ0Pmy (ORCPT ); Wed, 27 Oct 2004 11:42:54 -0400 Received: from merkurneu.hrz.uni-giessen.de ([134.176.2.3]:33959 "EHLO merkurneu.hrz.uni-giessen.de") by vger.kernel.org with ESMTP id S262494AbUJ0Pkg (ORCPT ); Wed, 27 Oct 2004 11:40:36 -0400 Date: Wed, 27 Oct 2004 17:39:50 +0200 (CEST) From: Sergei Haller X-X-Sender: gc1007@fb07-2go.math.uni-giessen.de To: Andreas Klein Cc: Andi Kleen , Andrew Walrond , "Rafael J. Wysocki" , linux-kernel@vger.kernel.org Subject: Re: solution Re: lost memory on a 4GB amd64 In-Reply-To: Message-Id: References: <200409241315.42740.andrew@walrond.org> <200410221026.22531.andrew@walrond.org> <20041022182446.GA77384@muc.de> <20041023164902.GB52982@muc.de> Organization: University of Giessen * Germany MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-HRZ-JLUG-MailScanner-Information: Passed JLUG virus check X-HRZ-JLUG-MailScanner: Found to be clean Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2028 Lines: 59 On Wed, 27 Oct 2004, Andreas Klein (AK) wrote: AK> Hello, AK> AK> the problem has been verified by Tyan. It is definately a hardware issue. AK> The Tyan and AMD engineers are developing a solution (BIOS) for the AK> problem. AK> They will fix the problem for the S2885, as weel as for the S2875 boards. Are you sure this is the same problem, that I have? You discovered Problems with memtest86: > Memtest sees 0-2GB mem usable and 4-6GB unusable (complains > about each memory address). I didn't: > memtest86 is happy with the memory. The next difference: You have the S2885 (thunder K8W) and S2875S (tiger K8W single processor) boards and I have a S2875 (tiger K8W double processor) I summarize (again) my problems: Independantly of the memory settings in the BIOS: - non-SMP Kernel is stable - memtest86 does not report any errors If the memory (4GB) is set up in one block (0-4GB) in the BIOS, then - SMP Kernel is stable If the memory (4GB) is set up in two blocks (eg. 0-3GB, 4-5GB) in the BIOS, then - SMP Kernel is stable _if_and_only_if_ NUMA is _disabled_. BTW.: I won't be able to flash a new BIOS to our machine, since it is in production use and runs _rock_stable_ with _full_memory_ after we _disabled_ NUMA support in the kernel. (see the two small programs posted by me and by Andi Kleen) What I COULD do is running some tests if needed. (e.g. to check if the Board/BIOS is lying about its capabilities) Sergei -- -------------------------------------------------------------------- -?) eMail: Sergei.Haller@math.uni-giessen.de /\\ -------------------------------------------------------------------- _\_V Be careful of reading health books, you might die of a misprint. -- Mark Twain - 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/