Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262464AbUJ0QHD (ORCPT ); Wed, 27 Oct 2004 12:07:03 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262505AbUJ0QHC (ORCPT ); Wed, 27 Oct 2004 12:07:02 -0400 Received: from wrzx35.rz.uni-wuerzburg.de ([132.187.3.35]:50572 "EHLO wrzx35.rz.uni-wuerzburg.de") by vger.kernel.org with ESMTP id S262464AbUJ0QFt (ORCPT ); Wed, 27 Oct 2004 12:05:49 -0400 Date: Wed, 27 Oct 2004 18:05:40 +0200 (CEST) From: Andreas Klein X-X-Sender: asklein@pluto.physik.uni-wuerzburg.de To: Sergei Haller 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> MIME-Version: 1.0 X-MIMETrack: Itemize by SMTP Server on domino1/uni-wuerzburg(Release 6.51HF561 | September 17, 2004) at 10/27/2004 18:05:40, Serialize by Router on domino1/uni-wuerzburg(Release 6.51HF561 | September 17, 2004) at 10/27/2004 18:05:43, Serialize complete at 10/27/2004 18:05:43 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3115 Lines: 88 Hello, On Wed, 27 Oct 2004, Sergei Haller wrote: > On Wed, 27 Oct 2004, Andreas Klein (AK) wrote: > > 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. Memtest is happy with my memory too, if all 4 modules are installed in the slots belonging to CPU1. If I install 2 modules for each CPU, memtest86 is not happy anymore. > > 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) The boards are nearly identical (on-board lan is different, and your memory-slots are connected to one CPU). If all memory modules are installed for one CPU, I have your problems. Additionaly there are some other problems that only occur, when the modules are installed one pair for each CPU. Since I have a pre-producion board and bios which is running solid as a rock, regardless if a SMP/no-SMP kernel is installed, I hope that they will fix all problems. > 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/ > -- Andreas Klein asklein@cip.physik.uni-wuerzburg.de root / webmaster @cip.physik.uni-wuerzburg.de root / webmaster @www.physik.uni-wuerzburg.de _____________________________________ | | | Long live our gracious AMIGA! | |___________________________________| - 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/