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

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Tue, 2011-02-08 at 11:32 +0000, Daniel Bauer wrote:
> 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.

There is no switch, 16GB is a fundamental limitation of the 32 bit
hypervisor.

Ian.



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