RE: [Xen-users] 32bit or 64bit?

["Kraska, Joe A \(US SSA\)" <joe.kraska@xxxxxxxxxxxxxx>]

PAE (which all modern x86 cpus have) will support up to 64GB physical.

Main restriction is that for an application to support more than 4GB
of addressable memory on 32 bit PAE systems, they have to be compiled
a special way. If you don't have any processes which want to address
more than 4GB, 32 bit PAE will work fine for you.

I don't think 64bit xen is considered fully baked yet, although it
certainly is workable for investigation purposes (from experience).

Joe.

> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-
> bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Peter Peltonen
> Sent: Thursday, March 01, 2007 2:25 PM
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-users] 32bit or 64bit?
> 
> My processor is AMD Athlon(tm) 64 X2 Dual Core Processor 5200+ and
> I've got 6 Gb of memory.
> 
> I'm planning to put up a few database / web servers under RHEL5.
> 
> Should I install 32bit or 64bit OS for my dom0 / domUs?
> 
> I remember faintly reading from somewhere that you benefit from 64bit
> only if you have
> lots of memory (over 8 gigs). Is this true?
> 
> Regards,
> Peter
> 
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