From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755512AbYGVUzo (ORCPT ); Tue, 22 Jul 2008 16:55:44 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752787AbYGVUze (ORCPT ); Tue, 22 Jul 2008 16:55:34 -0400 Received: from lucidpixels.com ([75.144.35.66]:39263 "EHLO lucidpixels.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751994AbYGVUzd (ORCPT ); Tue, 22 Jul 2008 16:55:33 -0400 Date: Tue, 22 Jul 2008 16:55:32 -0400 (EDT) From: Justin Piszcz To: Rik van Riel cc: linux-kernel@vger.kernel.org, Alan Piszcz Subject: Re: 128 GiB memory question-- kernel only sees 64GiB? In-Reply-To: <20080722104327.30cee9be@bree.surriel.com> Message-ID: References: <20080722104327.30cee9be@bree.surriel.com> User-Agent: Alpine 1.10 (DEB 962 2008-03-14) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 22 Jul 2008, Rik van Riel wrote: > On Tue, 22 Jul 2008 10:21:44 -0400 (EDT) > Justin Piszcz wrote: > >> To be able to utilize 128 GiB of memory on a host, does one need to enable >> NUMA support? Currently only 64 GiB is showing up. > > How much memory does the BIOS say the system has? Asked them. > > Can you get the e820 memory map (from early boot up) of the systems? Probably can't get this. > >> As far as machine name/motherboard type, I do not have this information >> currently but I am told there are one or two of these boxes are running >> CentOS 5.x and/or RHEL5/AS. > > Hopefully not with 64GB each :)) Nope :P > >> Is there something special you need to do to utilize all 128 GiB of >> memory? > > You need to use a 64 bit kernel, for one. Will verify what they are running, thanks.