Re: [Xen-devel] more than 16 GB in a 32 Bit dom0

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Tue, 2011-02-08 at 10:42 +0000, Daniel Bauer wrote:
> Hallo Pasi,
> 
> From: "Pasi KÃrkkÃinen"
> > On Tue, Feb 08, 2011 at 08:27:02AM +0100, Daniel Bauer wrote:
> >> I've read in many posts, that XEN limits the 32 bit PAE kernel to 16 
> >> GB
> >> RAM, but I don't find were to enable more. Starting linux without XEN
> >> shows the whole memory. Is there still no solution?
> >>
> >> I don't have the possibility to upgrade the server to 64 bit.
> >>
> >
> > You can run 64bit hypervisor (xen.gz) with a 32bit PAE dom0 Linux 
> > kernel.
> > Maybe that's an option for you..
> 
> if it works, why not! But what are the issues about this solution?

None really.

It's certainly preferable to run a 64 bit hypervisor whenever possible
but running a 32 bit domain 0 is a very reasonable configuration.

It's the default for XCP and XenServer for example and works quite well
there.

> > That allows you to use all the available memory for VMs, and dedicate
> > some memory (say, 1GB) for a 32bit dom0.

It also allows you to run a mixture of 32 and 64 bit guests.

Ian.


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