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

From: Justin Piszcz
Date: Tue Jul 22 2008 - 16:55:45 EST

On Tue, 22 Jul 2008, Rik van Riel wrote:

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

You need to use a 64 bit kernel, for one.
Will verify what they are running, thanks.
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