Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S267597AbUIXEiv (ORCPT ); Fri, 24 Sep 2004 00:38:51 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S267679AbUIXEiv (ORCPT ); Fri, 24 Sep 2004 00:38:51 -0400 Received: from merkurneu.hrz.uni-giessen.de ([134.176.2.3]:29175 "EHLO merkurneu.hrz.uni-giessen.de") by vger.kernel.org with ESMTP id S267597AbUIXEir (ORCPT ); Fri, 24 Sep 2004 00:38:47 -0400 Date: Fri, 24 Sep 2004 14:38:27 +1000 (EST) From: Sergei Haller X-X-Sender: gc1007@fb07-calculator.math.uni-giessen.de To: jonathan@jonmasters.org Cc: linux-kernel , linux-smp Subject: Re: lost memory on a 4GB amd64 In-Reply-To: Message-Id: References: <200409161528.19409.andrew@walrond.org> <200409161619.28742.andrew@walrond.org> <35fb2e59040919130154966337@mail.gmail.com> <35fb2e5904091915007c02c4b8@mail.gmail.com> Organization: University of Giessen * Germany MIME-Version: 1.0 Content-Type: TEXT/PLAIN; CHARSET=US-ASCII Content-ID: 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: 1625 Lines: 39 I just discovered the linux-smp list and decided to summarize the topic and take the opportunity to cross-post to there. an archive of the discussion can be found e.g. here: http://marc.theaimsgroup.com/?t=109525952600004&r=1&w=4 The machine at hand is the Tyan Tiger K8W with two Opterons 246 (http://www.tyan.com/products/html/tigerk8w.html) and 4GB of memory we are using vanilla 2.6.8.1 kernel. * if the memory is set up in the ordinary way in the BIOS, then approximately 512MB are lost (PCI/AGM adressing and stuff), but everything is stable * if the memory is set up in the BIOS to be in two chunks (e.g. 3GB at the address range 0-3GB and 1GB at 4-5GB address range), then - memtest86 tells everything is fine. - if we run a non-SMP kernel, everything is stable - if we run an SMP kernel, it crashes as soon as approx. 1GB of memory is allocated and set to 0 (see the test case C-program in my previous mail) Is there anything we can do? Any logs I can provide? Something to try out? Thanks, 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/