Re: [Xen-devel] Memory limits?

[Mark Williamson <Mark.Williamson@xxxxxxxxxxxx>]

> I am relatively new to Xen and have a question regarding memory: I was not
> able to find out what the limit of memory is I can assign to a guest
> system. How much memory can I assign to each guest:

> * not more than physical memory in the machine?

Yes, Xen doesn't do swapping.  If swapping is needed, the guests should be 
configured to do it themselves.

> * not more than physical memory minus memory used by dom0 and other doms?

Correct.  Bear in mind Xen uses some memory too.

> * not more than 4GB?

Correct, on x86 we don't support the PAE36 mode required to support more than 
4GB.  This is not an insurmountable technical limitation, it's just that it's 
not deemed worth the development time.  On other systems (e.g. x86_64), 
larger memories does not have the same problems.

Cheers,
Mark

> * something totally different?
>
> By the way: I am using SuSE 9.2 with the Xen packages from
> http://www.suse.de/~garloff/linux/xen/ - don't know if that has any
> influence on which answer applies to my question.
>
> Rene
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