Xen users - Jul 2008 - Xen 32 w/PAE will not allow over 16GB RAM

We have faced a limitation when Xen 32bit running PAE will not allow 
over 16GB RAM.  I came across this message: 
http://lists.xensource.com/archives/html/xen-devel/2005-11/msg00159.html

However I''m not sure this still holds?

Is there anyway around this limitation other changing to 64bit?

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I''m not aware of that limit having been lifted.

Just wanted to point out that if you have 64-bit hardware available, you can 
run a 64-bit Xen with a 32-bit PAE dom0 and domUs, so it''s not
necessary to
completely rebuild your system in order to make such a switch.

Cheers,
Mark

On Tuesday 22 July 2008, Aaron Weller // Crucial Paradigm
wrote:
> We have faced a limitation when Xen 32bit running PAE will not allow
> over 16GB RAM.  I came across this message:
> http://lists.xensource.com/archives/html/xen-devel/2005-11/msg00159.html
>
> However I''m not sure this still holds?
>
> Is there anyway around this limitation other changing to 64bit?
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users


-- 
Push Me Pull You - Distributed SCM tool (http://www.cl.cam.ac.uk/~maw48/pmpu/)

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Hi Mark,

Thanks for the quick reply.

The problem we currently have is we were not aware of the 16GB  
limitation, and built our hardware with 32GB - so rather than moving  
and starting from scratch with new hardware, want to try and work  
around if possible.  Also the software we are using to manage Xen  
(Hypervm) does not have the best support for 64-bit so I hear, and I  
don''t think they support running 32bit guests on a 64bit host.

If we make the change in  
http://lists.xensource.com/archives/html/xen-devel/2005-11/msg00159.html , and  
rebuild the kernel with support for 32GB RAM are we likely to run into  
any problems?

Cheers!
Aaron

Quoting Mark Williamson <mark.williamson@cl.cam.ac.uk>:
> I''m not aware of that limit having been lifted.
>
> Just wanted to point out that if you have 64-bit hardware available, you
can
> run a 64-bit Xen with a 32-bit PAE dom0 and domUs, so it''s not
necessary to
> completely rebuild your system in order to make such a switch.
>
> Cheers,
> Mark
>
> On Tuesday 22 July 2008, Aaron Weller // Crucial Paradigm wrote:
>> We have faced a limitation when Xen 32bit running PAE will not allow
>> over 16GB RAM.  I came across this message:
>>
http://lists.xensource.com/archives/html/xen-devel/2005-11/msg00159.html
>>
>> However I''m not sure this still holds?
>>
>> Is there anyway around this limitation other changing to 64bit?
>>
>> _______________________________________________
>> Xen-users mailing list
>> Xen-users@lists.xensource.com
>> http://lists.xensource.com/xen-users
>
>
>
> --
> Push Me Pull You - Distributed SCM tool   
> (http://www.cl.cam.ac.uk/~maw48/pmpu/)
>



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