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

["Daniel Bauer" <mlist@xxxxxxxxxxx>]

Hi Ian,

From: "Ian Campbell"
> On Tue, 2011-02-08 at 10:42 +0000, Daniel Bauer wrote:
> > 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.
I just tried it now, but the system doesn't boot. The reason why I can't 
upgrade to 64 bit is, that the server is only a 32 bit box (HP ProLiant 
DL760 G2, 8 x 3 GHz Xeon, 64 GB RAM). IMHO I need a 64 Bit CPU to run 
the 64 bit xen.gz, or?
Thanks
Daniel 

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