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xen-devel
RE: [Xen-devel] Memory limits?
The 4GB limitation mentioned here is for guests. What about the host?
Does the same limitation apply to the host? If yes... Could you tell me
how much effort is involved in enabling PAE mode in 32-bit Xen? What
components would need to be modified?
Aravindh
-----Original Message-----
From: xen-devel-admin@xxxxxxxxxxxxxxxxxxxxx
[mailto:xen-devel-admin@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of Mark
Williamson
Sent: Monday, February 21, 2005 5:57 PM
To: xen-devel@xxxxxxxxxxxxxxxxxxxxx
Cc: Rene Auberger
Subject: Re: [Xen-devel] Memory limits?
> 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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