Re: [Xen-users] HVM or not HVM?

[Nico Kadel-Garcia <nkadel@xxxxxxxxx>]

Johann Spies wrote:
> On Fri, Aug 24, 2007 at 04:02:33PM +0100, Mark Williamson wrote:
>   
> > > In a VPS environment (a dom0 which hosts some domU used as VPS by some
> > > customers, and you don't know what customers do with the domUs), do
> > > you think it is better to use HVM domU or non-HVM domUs?
> > >       
> > HVM will give you greater flexibility in terms of what guest OSes you can 
> > offer to customers (e.g. non-Linux, maybe older Linux, etc).
> > PV should achieve better per-guest performance, and therefore let you run more 
> >     
> This is a suprise to me.  I would have thought that one would get
> better performance from a HVM guest.  Why would PV 'achieve better
> per-guest performance'?
>   
There's a nice nutshell explanation at 
http://virt.kernelnewbies.org/TechOverview. Basically certain operations 
are *extremely* expensive to virtualization. Para-virtualized kernels 
simply don't use those operations. (I use the word "simply" in a very 
genteel sort of way, it's not that simple.)
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