[Fedora-xen] HVM Performance and PV drivers

[Lamont Peterson]

On Thursday 08 February 2007 10:08am, Jim Klein wrote:
> Anyone been able to get the PV drivers from Xensource to work on an
> FC6 created HVM. Performance is rather sluggish, even on 64bit,
> without these, yet they don't seem to want to work here. Or,
> alternatively, is Red Hat working on their own? The HVM IO is really
> a bit too slow for most production use without them.

I don't believe that you can do this.

But, I'm wondering what OS you're trying to run on the HVM DomU.  If it's 
Linux, use a paravirtualized DomU.  You'll get much better performance 
(especially on things like I/O).

HVM adds some emulation overhead and, thus, is slower than PV.  HVM is only 
necessary to run an OS for which no paravirtualized kernel is available.
-- 
Lamont Peterson <lamont at gurulabs.com>
Senior Instructor
Guru Labs, L.C. [ http://www.GuruLabs.com/ ]

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