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

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Tue, 2011-02-08 at 11:30 +0000, Daniel Bauer wrote:
> 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?

Er, yeah, you need a 64 bit processor.

> 
> Thanks
> Daniel 
> 
> 
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