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RE: [Xen-users] Dom0 Maximum Memory Support

To: "志波 唐" <hunter_tzb@xxxxxxxxxxxx>
Subject: RE: [Xen-users] Dom0 Maximum Memory Support
From: "Petersson, Mats" <Mats.Petersson@xxxxxxx>
Date: Wed, 30 May 2007 11:49:30 +0200
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Thread-topic: [Xen-users] Dom0 Maximum Memory Support

> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of ?? ?
> Sent: 29 May 2007 08:47
> To: xen-users@xxxxxxxxxxxxxxxxxxx; xen devel
> Subject: [Xen-users] Dom0 Maximum Memory Support
> Hi there,
> I am running SLES 10 32 bits in PAE modes, I installed 32 GB 
> physical memory, but only find 16GB when booted into Xen 
> kernel in Domain 0.
> Is this a constraint for Xen 32 bits PAE?

Yes, the limit for 32-bit PAE is 16GB, and it's because Xen uses the upper two 
bits for "internal use" in the page-table entry. 

If you use 64-bit Xen hypervisor + Dom0 and use the latest 3.1 release, you 
should be able to run 32-bit PAE guests on top of that, and use ALL the memory 
in the machine. Or simply use 64-bit guests as well, of course. 

> Rgds
> Hutner Tang
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