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

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Message-ID: <20080722171441.6daee243@bree.surriel.com>
Date:	Tue, 22 Jul 2008 17:14:41 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Justin Piszcz <jpiszcz@...idpixels.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 16:55:32 -0400 (EDT)
Justin Piszcz <jpiszcz@...idpixels.com> wrote:
> 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.

It looks roughly like this:

BIOS-provided physical RAM map:
 BIOS-e820: 0000000000000000 - 00000000000a0000 (usable)
 BIOS-e820: 0000000000100000 - 00000000bfb50000 (usable)
 BIOS-e820: 00000000bfb50000 - 00000000bfb66000 (reserved)
 BIOS-e820: 00000000bfb66000 - 00000000bfb85c00 (ACPI data)
 BIOS-e820: 00000000bfb85c00 - 00000000c0000000 (reserved)
 BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved)
 BIOS-e820: 00000000fe000000 - 0000000100000000 (reserved)
 BIOS-e820: 0000000100000000 - 0000000440000000 (usable)

Getting this info will be very useful.
 
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