Re: [Xen-users] adios to XEN

[Grant McWilliams <grantmasterflash@xxxxxxxxx>]

On Mon, May 24, 2010 at 4:53 AM, chris <tknchris@xxxxxxxxx> wrote:

Is this an april fools joke? Where would anyone get that crazy idea? :)

- chris

This is actually a common misconception that I run into a lot. If you think about other situations 
though it sort of makes sense - something in hardware is usually faster than the same thing in software. Think 3D acceleration.

However, in virtualization it's very much the opposite. A paravirtualized OS is aware that it's being
virtualized making it much better at handling being virtualized. A full virtualized OS relies on hardware

being smart enough to catch requests from the Virtual Machine and direct them to a different location.
The virtual OS has no knowledge of being virtualized thus is not helping in any way.

In some aspects full virt is catching up to paravirt but it seems that Xen when it moves to hybrid virtualization

will use full virt in those cases where it may be faster and paravirt everywhere else.


KVM without paravirtualized drivers has exactly the same problems as Xen without paravirtualized drivers.


Grant McWilliams

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