Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752687AbXE3Iyt (ORCPT ); Wed, 30 May 2007 04:54:49 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750897AbXE3Iym (ORCPT ); Wed, 30 May 2007 04:54:42 -0400 Received: from lucidpixels.com ([75.144.35.66]:57408 "EHLO lucidpixels.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750826AbXE3Iyl (ORCPT ); Wed, 30 May 2007 04:54:41 -0400 Date: Wed, 30 May 2007 04:54:40 -0400 (EDT) From: Justin Piszcz X-X-Sender: jpiszcz@p34.internal.lan To: Robert Hancock cc: linux-kernel@vger.kernel.org Subject: Re: Kernel 2.6.21.3 does not work with 8GB of RAM on Intel 965WH motherboards. In-Reply-To: Message-ID: References: <465CF8CA.8070009@shaw.ca> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1490 Lines: 53 On Wed, 30 May 2007, Justin Piszcz wrote: > > > On Tue, 29 May 2007, Robert Hancock wrote: > >> Justin Piszcz wrote: >>> Short Description of Problem: >>> Linux 2.6.21.3 does not run properly with 8GB of ram on the Intel 965WH >>> motherboard. >>> I found it interesting in make menuconfig on x86_64 there is no 4GB/64GB >>> options in the kernel that I remember seeing in 32bit. >> >> That's because that option is not applicable in 64-bit mode. >> >> Can you send your full dmesg output from the 8GB bootup? >> >> -- >> Robert Hancock Saskatoon, SK, Canada >> To email, remove "nospam" from hancockr@nospamshaw.ca >> Home Page: http://www.roberthancock.com/ >> > > Kernel dmesg attached from 8GB bootup. > > Robert, how come the option is not applicable in 64-bit mode? If I want to > use all 8GB of memory I need to run a 32-bit kernel? > > Justin. Look at how slow the raid benchmarks are in dmesg with 8GB of memory! [ 59.592560] raid6: using algorithm sse2x4 (476 MB/s) [ 59.597558] raid5: using function: generic_sse (56.000 MB/sec) Yikes! With mem=4096M: [ 60.336352] raid6: using algorithm sse2x4 (6804 MB/s) [ 60.341345] raid5: using function: generic_sse (8552.000 MB/sec) What is going on here? Justin. - 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/