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

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Message-ID: <alpine.DEB.1.10.0807221654480.11681@p34.internal.lan>
Date:	Tue, 22 Jul 2008 16:55:03 -0400 (EDT)
From:	Justin Piszcz <jpiszcz@...idpixels.com>
To:	Peter Zijlstra <peterz@...radead.org>
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, Peter Zijlstra wrote:

> 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?
>

Sun X4600, will find out if they are running the right kernel and also 
check the BIOS, thanks.

Justin.
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