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

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Message-ID: <86802c440807230121o584d2573g8ec4d4fde857aa3b@mail.gmail.com>
Date:	Wed, 23 Jul 2008 01:21:01 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Justin Piszcz" <jpiszcz@...idpixels.com>
Cc:	"Peter Zijlstra" <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, "Alan Piszcz" <ap@...arrain.com>
Subject: Re: 128 GiB memory question-- kernel only sees 64GiB?

On Tue, Jul 22, 2008 at 1:55 PM, Justin Piszcz <jpiszcz@...idpixels.com> wrote:
>
>
> 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.

so you are using 32 bit kernel?

uname -a

could tell arch

YH
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