[svlug] (forw) KVM vs Xen

Michael Eager eager at eagercon.com
Wed Oct 14 10:52:21 PDT 2015

On 10/14/2015 12:32 AM, Rick Moen wrote:
> Forwarded with permission from the main mailing list of Linux Users of
> Victoria (Melbourne).
> ----- Forwarded message from Russell Coker <russell at coker.com.au> -----
> Date: Wed, 14 Oct 2015 16:20:13 +1100
> From: Russell Coker <russell at coker.com.au>
> To: luv-main at luv.asn.au
> Subject: KVM vs Xen
> Xen has been widely regarded as the best performance VM for Linux for a long
> time.  Oracle has been one of the advocates of Xen claiming very close to
> native hardware performance.
> # 300% improvement in UnixBench score, with a KVM Linode vs a Xen Linode
> # 28% faster at compiling a Linux kernel with a KVM Linode vs a Xen Linode
> # Boot and shutdown times are greatly improved

It's difficult to believe that a full virtualization environment would have
better performance than a paravirtualization environment, especially three-
fold difference.  There has to be some reason, other than the virtualization
model, which is the bottleneck.  IMO, anything which can be done in a virtualized
environment to improve performance can also be done in a paravirtualization
environment.  The converse is not true.

Michael Eager	 eager at eagercon.com
1960 Park Blvd., Palo Alto, CA 94306  650-325-8077

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