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xen-users
Re: [Xen-users] 32bit or 64bit dom0?
On Tue, Jan 26, 2010 at 06:22:38PM +0700, Fajar A. Nugraha wrote:
> On Tue, Jan 26, 2010 at 3:06 PM, Ian Tobin <itobin@xxxxxxxxxxxxx> wrote:
> > Thanks for the info guys, ive been playing with 3.4.2 on 32bits but im
> > thinking for the future it would be worth having 64bits for things like
> > win2008R2 as this is 64 bit only.
>
> If Windows is your only concern, IIRC 32bit xen can run 64bit HVM
> domUs just fine. What does "xm info" say about caps?
>
I think you need 64b Xen hypervisor to run 64b guests,
but dom0 Linux can be still 32bit PAE.
> Personally I use 64bit xen, dom0, and domU so it would be easier when
> I need to assign one of them with memory over 4GB, since using 32bit
> PAE has some performance penalty.
>
I think there was some benchmarks about this recently and the
PAE performance hit wasn't very big..
Anyway, it's better to use 64b nowadays.
-- Pasi
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