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

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Message-ID: <alpine.DEB.1.10.0807221655140.11681@p34.internal.lan>
Date:	Tue, 22 Jul 2008 16:55:32 -0400 (EDT)
From:	Justin Piszcz <jpiszcz@...idpixels.com>
To:	Rik van Riel <riel@...hat.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, Rik van Riel wrote:

> 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?
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.
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