Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S268657AbUIXJlS (ORCPT ); Fri, 24 Sep 2004 05:41:18 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S268652AbUIXJlS (ORCPT ); Fri, 24 Sep 2004 05:41:18 -0400 Received: from host213-160-108-25.dsl.vispa.com ([213.160.108.25]:5834 "EHLO cenedra.walrond.org") by vger.kernel.org with ESMTP id S268650AbUIXJlK (ORCPT ); Fri, 24 Sep 2004 05:41:10 -0400 From: Andrew Walrond To: "Rafael J. Wysocki" Subject: Re: lost memory on a 4GB amd64 Date: Fri, 24 Sep 2004 10:41:08 +0100 User-Agent: KMail/1.7 Cc: linux-kernel@vger.kernel.org, Sergei Haller References: <200409241127.38529.rjw@sisk.pl> In-Reply-To: <200409241127.38529.rjw@sisk.pl> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-2" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200409241041.08975.andrew@walrond.org> X-Spam-Score: 0.0 (/) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1527 Lines: 35 On Friday 24 Sep 2004 10:27, Rafael J. Wysocki wrote: > > > AW> cpu1's bank. How are yours arranged? > > > > my board has only four banks, each of them has a 1GB module sitting. > > (page 26 of ftp://ftp.tyan.com/manuals/m_s2875_102.pdf) > > Which is what makes the difference, I think. IMO, the problem is that > _both_ CPUs use the same memory bank that is physically attached to only > one of them which leads to conflicts, apparently (the CPU with memory has > also PCI/AGP/whatever attached to it via HyperTransport so I can imagine > there may be issues with overlapping address spaces etc.). I'd bet that > there's something wrong either with the BIOS or with the board design > itself and I don't think there's anything that the kernel can do about it > (usual disclaimer applies). > > Out of couriosity: have you tried to run the kernel with K8 NUMA enabled? > Actually, the block diagram on page 9 of the manual suggests that this is _not_ a NUMA board, since all DIMMS are connected to cpu1. The block diagram for my thunder k8w specifically shows DIMMS associated with individual processors. Which suggests that NUMA show be _disabled_ in the kernel config. Have you tried it with NUMA disabled? I think I remeber it being on in the .config you sent me. Andrew - 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/