Re: [Xen-users] differences between Para-Virtualization and Full-Virtualization?

[Nico Kadel-Garcia <nkadel@xxxxxxxxx>]

Songtao Liu wrote:
> Hi,
>
> Could someone explain me the following questions:
>
> Where are differences between Para-Virtualization and Full-Virtualization in 
> the aspects of memory management, CPU and Device I/O, Network?
>
> How is the performance difference between them?
>
> Thanks
> Songtao
There are dozens of good documents on this. Boiled down to a few lines, 
full virtualization emulates the entire hardware platform of a guest 
computer. That can be effective for running an otherwise incompatible 
operating sytem, like Windows on a Linux server.
Para-virtualization uses a customized kernel, compatible with the host's 
kernel and "hypervisor", that speaks compatibly and much more directly 
to your host's hardware. It's much lighter weight, allows memory to be 
re-allocated among guest domains so a server can run far more guest 
domains,, and provides a really noticeable to any guest operation that 
has to talk to the disk. But it requires a compatible kernel on the 
guest OS, compatible with the Xen version of the host OS.
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