linux-kernel - Re: 128 GiB memory question-- kernel only sees 64GiB?

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Message-ID: <20080722104327.30cee9be@bree.surriel.com>
Date:	Tue, 22 Jul 2008 10:43:27 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Justin Piszcz <jpiszcz@...idpixels.com>
Cc:	linux-kernel@...r.kernel.org, Alan Piszcz <ap@...arrain.com>
Subject: Re: 128 GiB memory question-- kernel only sees 64GiB?

On Tue, 22 Jul 2008 10:21:44 -0400 (EDT)
Justin Piszcz <jpiszcz@...idpixels.com> 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?

Can you get the e820 memory map (from early boot up) of the systems?

> 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 :))

> 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.

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