Re: [Xen-users] 32bit or 64bit dom0?

[Pasi Kärkkäinen <pasik@xxxxxx>]

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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