Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S268602AbUIXJ0N (ORCPT ); Fri, 24 Sep 2004 05:26:13 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S268609AbUIXJ0N (ORCPT ); Fri, 24 Sep 2004 05:26:13 -0400 Received: from grendel.digitalservice.pl ([217.67.200.140]:2707 "HELO mail.digitalservice.pl") by vger.kernel.org with SMTP id S268602AbUIXJ0L (ORCPT ); Fri, 24 Sep 2004 05:26:11 -0400 From: "Rafael J. Wysocki" To: linux-kernel@vger.kernel.org Subject: Re: lost memory on a 4GB amd64 Date: Fri, 24 Sep 2004 11:27:38 +0200 User-Agent: KMail/1.6.2 Cc: Sergei Haller , Andrew Walrond References: <200409240931.42356.andrew@walrond.org> In-Reply-To: MIME-Version: 1.0 Content-Disposition: inline Content-Type: text/plain; charset="iso-8859-2" Content-Transfer-Encoding: 7bit Message-Id: <200409241127.38529.rjw@sisk.pl> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1703 Lines: 39 On Friday 24 of September 2004 10:57, Sergei Haller wrote: > On Fri, 24 Sep 2004, Andrew Walrond (AW) wrote: > > AW> On Friday 24 Sep 2004 09:23, Sergei Haller wrote: > AW> > It's the same for me if I use the non-SMP version of the kernel. > AW> > but the SMP one seems to be panicking for some reason. > AW> > > AW> > AW> Just a thought; How are the memory modules arranged on the board? > AW> I have 2 x 1Gb modules in each cpu-specific bank, rather than all four in > 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? Greets, RJW -- - Would you tell me, please, which way I ought to go from here? - That depends a good deal on where you want to get to. -- Lewis Carroll "Alice's Adventures in Wonderland" - 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/