Re: [Xen-users] xen & kernel pae

[Mark Williamson <mark.williamson@xxxxxxxxxxxx>]

I think 32-bit Xen is limited to only 16G of physical RAM.  This still leaves 
1G to account for; a possible guess would be that you have a *very* large 
memory hole on your system and that's pushing the addresses of the real 
physical RAM up to where Xen can't use them :-(

64-bit Xen should be able to access all your memory, I think.  And you should 
be able to run 32-bit PAE guests in any part of that memory; they may even be 
able to grow beyond 16G but I'm not sure on that point.

Cheers,
mark

On Monday 28 April 2008, Marco Strullato wrote:
> Hi all, I'm installing xen 3.0 (supplied with centos 5.0) into a
> xerver with 26GB of ram.
> I know that xen kernel has "pae" built in but the problem is that the
> hypervisor can "see" only 15GB.
> I tried also to pass a parameter at boot: mem=26G. Nonthing has
> changes, the system can manage only 15GB of RAM.
>
> Do you know why?
>
> Thanks
>
> Marco
>
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