Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760595AbXFIUi5 (ORCPT ); Sat, 9 Jun 2007 16:38:57 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757782AbXFIUiu (ORCPT ); Sat, 9 Jun 2007 16:38:50 -0400 Received: from pythagoras.zen.co.uk ([212.23.3.140]:45118 "EHLO pythagoras.zen.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757628AbXFIUit (ORCPT ); Sat, 9 Jun 2007 16:38:49 -0400 Message-ID: <466B0FD7.8050702@gmail.com> Date: Sat, 09 Jun 2007 21:38:47 +0100 From: Matt Keenan User-Agent: Thunderbird 1.5.0.12 (X11/20070604) MIME-Version: 1.0 To: Andrew Lyon CC: Kernel Mailing List Subject: Re: [RFC][PATCH] Re: 4Gb ram not showing up References: <20070606143723.GF10008@csclub.uwaterloo.ca> <46673135.30105@zytor.com> <46682FED.2080506@zytor.com> In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Originating-Pythagoras-IP: [82.69.27.224] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1744 Lines: 43 Andrew Lyon wrote: > On 6/7/07, H. Peter Anvin wrote: >> Andrew Lyon wrote: >> > >> > Could this also cause a system to be unstable? my abit athlon64 at >> > work will not run x64 with more than 1gb ram, and i have a colo server >> > with supermicro & 2 x dual core xeons that will not run with more than >> > 2gb. >> > >> > Both systems have long uptimes but if i add ram they crash within >> > minutes of booting. >> > >> >> That's much more likely to be caused by bad memory bus layout so that it >> doesn't handle the higher loading. >> >> Run memtest86+ on the expanded memory for some time. >> >> -hpa >> > > I have run memtest86+ for days at a time on both systems with no > errors at all. > > broken hardware i guess, i am not surprised about the abit board, ive > had nothing but trouble with abit motherboards and do not use them any > more, but the supermicro is a xeon server board and i was using > kingston ram, i wouldnt expect that to have issues. I have had problems with kingston ram and heavily populated boards (being ASUS boards didn't help either). I have found through trial and error that gigabyte and/or msi boards with crucial memory seems to work the best, and for servers i always buy low latency ecc ram, even if it is a slower frequency. I also had problems with machines that passed memtest but failed in real life.. you may also want to check your power supply and make sure you buy boards with multiple (6 or more) voltage regulators. Matt - 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/