Re: [Xen-users] para- and full-virtualization on same system?

[Kent Watsen <kent@xxxxxxxxxx>]

Mark wrote:
> These would need to run in an HVM (full virt) domain, since OpenBSD 
> doesn't have support for Xen. I'm not sure it's as well tested as 
> Linux / Windows under HVM, though,
Yikes! Do the fully-virtualized OSs need to be "well tested" - I thought 
the idea was that the OS would just work...or do you mean that the OS 
may not recognize some of the devices being provided by the virtual machine?
> Just 64-on-64 for now - for paravirt domains, the guest interface must 
> match
> the hypervisor. A compatability layer *may* appear at some point, but 
> it's
> not there yet.
I know that there are many optimizations yet to be made, but given 
current implementations, is there any performance comparisons between 
running a 32-bit xen-aware OS para-virtualized versus full-virtualized?  
For instance, its been said that a para-virtualized guest OS may be 3% 
slower than normal - how much slower would the same guest be if running 
fully-virtualized?

Thanks!
Kent

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