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

["Daniel Bauer" <mlist@xxxxxxxxxxx>]

From: "Ian Campbell"
> On Tue, 2011-02-08 at 10:42 +0000, Daniel Bauer wrote:
> > From: "Keir Fraser"
> > > On 08/02/2011 07:27, "Daniel Bauer" <mlist@xxxxxxxxxxx> 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.
> > >
> > > Then no.
> >
> > maybe a silly question, but who sets this limit? IMHO xen, because a
> > "normal" bigmem kernel accepts upto 64 GB RAM. Is there really no 
> > switch
> > to increase the RAM under a 32 bit kernel?
> The limitation is due to the 32 bit hypervisor, not the kernel.
I know, but I don't find the switch to configure more RAM than 16 GB. I 
thought that XEN limits it to 16 GB and I could change it and recompile 
everything.

> In my experience a 32 bit (PAE) kernel running on a 64 bit hypervisor
> works just fine with up to 32GB. In theory up to 160GB is possible in
> the hypervisor<->PAE-kernel ABI but the kernel tends to run out of
> lowmem in the 50-60GB range depending on your .config -- this true of
> native too.
It will be great if I could use 48 GB.

Ciao
Daniel 

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