This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


Re: [Xen-users] IBM x445, anyone using it?

On Tue, May 20, 2008 at 2:11 PM, Jeff Lane <sundowner225@xxxxxxxxx> wrote:
> On Tue, May 20, 2008 at 3:04 PM, Mark Williamson
> <mark.williamson@xxxxxxxxxxxx> wrote:
>> Nb VMware would give you full virtualisation support on your pre-HVM 
>> hardware,
>> which Xen can't give you.
> Good point...  but isn't there really a difference between say, full
> HVM virtualization on Xen and VMWare which is more emulation in this
> case?  That's just for curiosity sake...

VMWare does emulation for the 'hard' parts, where the existing 386-era
virtualization doesn't cut it.  it's heavily optimized, and does a lot
of code-modification on the fly to get it to manageable levels.

HVM-capable hardware makes it a lot easier, but (the first generation,
at least) incurs in heavy switching costs, so it's not a 'day and
night' performance advantage.  it's most a 'any hardware/complex code'
vs. 'new hardware/simpler code' tradeoff.

and, of course, VMWare is starting to use HVM capabilities for some
hard cases, and Xen/KVM are getting more PV into HVM...


Xen-users mailing list