Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S264377AbUISVsK (ORCPT ); Sun, 19 Sep 2004 17:48:10 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S264386AbUISVsK (ORCPT ); Sun, 19 Sep 2004 17:48:10 -0400 Received: from merkurneu.hrz.uni-giessen.de ([134.176.2.3]:37104 "EHLO merkurneu.hrz.uni-giessen.de") by vger.kernel.org with ESMTP id S264377AbUISVsB (ORCPT ); Sun, 19 Sep 2004 17:48:01 -0400 Date: Mon, 20 Sep 2004 07:47:20 +1000 (EST) From: Sergei Haller X-X-Sender: gc1007@fb07-calculator.math.uni-giessen.de To: jonathan@jonmasters.org Cc: linux-kernel Subject: Re: lost memory on a 4GB amd64 In-Reply-To: <35fb2e59040919130154966337@mail.gmail.com> Message-Id: References: <200409161528.19409.andrew@walrond.org> <200409161619.28742.andrew@walrond.org> <35fb2e59040919130154966337@mail.gmail.com> 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: 1942 Lines: 41 On Sun, 19 Sep 2004, Jon Masters (JM) wrote: JM> On Sun, 19 Sep 2004 00:18:38 +1000 (EST), Sergei Haller JM> JM> > * if the memory configuration is as follows: the first 3gb ar at the JM> > normal address range, the fourth gb is at the address range 4-5gb. JM> > then all 4gb are available (not quite -- a few mb ere missing, but JM> > thats ok) and JM> > - the SMP kernel panics as soon as I start X JM> JM> Just out of interest - can you say what tests you ran here - for JM> example whether you tried allocating large amounts of memory from a JM> userspace process without running X and/or touching bits of memory JM> mapped hardware? You say a kernel compile works fine so can you rule JM> out this being X taking down the system (you're previous mail seemed JM> somehat unclear). - as soon as I start X, the machine is gone. - if I compile the kernel (without X of course) its ok. the machine is supposed to be for scientific calculations and we run magma on it. The test I ran is just a one-liner which creates a matrix of size 20000x20000 with zeros in it. so basically it just allocates 1.6gb of memory and writes zeros in it. the SMP kernel with the above memory configuration crashes immediately. I guess I should write a simple C-program using malloc or something to reproduce the crash in the simplest possible way, shouldn't I? 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/