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

To:	Pasi Kärkkäinen <pasik@xxxxxx>
Subject:	Re: [Xen-users] 32bit or 64bit dom0?
From:	Grant McWilliams <grantmasterflash@xxxxxxxxx>
Date:	Tue, 26 Jan 2010 08:30:40 -0800
Cc:	"Fajar A. Nugraha" <fajar@xxxxxxxxx>, Ian Tobin <itobin@xxxxxxxxxxxxx>, Xen User-List <xen-users@xxxxxxxxxxxxxxxxxxx>
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On Tue, Jan 26, 2010 at 7:31 AM, Pasi Kärkkäinen <pasik@xxxxxx> wrote:

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

That depends one whether you consider (up to) 20% worth considering! I'd be willing to change for 5%.

http://www.phoronix.com/scan.php?page=article&item=616&num=1

Grant McWilliams

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