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Subject: Re: 128 GiB memory question-- kernel only sees 64GiB?
From: Peter Zijlstra <peterz@infradead.org>
To: Justin Piszcz <jpiszcz@lucidpixels.com>
Cc: linux-kernel@vger.kernel.org, Alan Piszcz <ap@solarrain.com>
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Date: Tue, 22 Jul 2008 16:28:03 +0200
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On Tue, 2008-07-22 at 10:21 -0400, Justin Piszcz wrote:
> Hello,
> 
> 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.
> 
> 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.

Sounds like you need to bug RH with that ;-)

> Is there something special you need to do to utilize all 128 GiB of 
> memory?

Does a recent kernel work for you? Also, you could at the very least
have mentioned your machine architecture; is it x86_64, ia64 or ppc64?