Re: [Xen-devel] Hypervisor Memory Limitations on 64-bit Architecture?

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Fri, Jul 18, 2008 at 12:56:34PM -0400, Joshua West wrote:
> Hey all,
> 
> I'm wondering if anybody could shed some light on this subject.  Are
> there limitations as to how much RAM a 64-bit Hypervisor will
> recognize/support under the Xen 3.1.x or 3.2.x series (or the upcoming
> 3.3.x if anything has changed)?
> 
> >From what I recall, a 32-bit Xen Hypervisor will recognize up to 16GB of
> RAM and a 64-bit Xen Hypervisor will recognize up to 32GB -- but I'm not
> certain on if 32GB is in fact the upper limit for 64-bit Xen.
> 

http://www.redhat.com/rhel/compare/

RHEL5 supports 16 GB of mem on x86 (32bit) platform. 
RHEL5 supports 256 GB of mem on x86_64 platform.

And RHEL5 contains Xen.

http://www.nabble.com/Unable-to-start-hvm-guest-on-cs16998-td15419631.html

"Running Xen Unstable changeset 16998 (pulled  20080208) on Unisys ES7000/one 
64x 256gb with SLE10SP1 x64."

There you have an actual server with 256 GB of mem running Xen :) 

(yeah, the mail is about problems, but hey, it's xen-unstable repository
they're testing there :)

-- Pasi

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