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Re: [libvirt] [Libguestfs] [PATCH libguestfs 0/4] Add a libvirt backend to libguestfs.



On Sun, Jul 22, 2012 at 09:43:04AM +0100, Richard W.M. Jones wrote:
> On Sat, Jul 21, 2012 at 08:20:45PM +0100, Richard W.M. Jones wrote:
> > This preliminary patch series adds a libvirt backend to libguestfs.
> > It's for review only because although it launches the guest OK, there
> > are some missing features that need to be implemented.
> 
> I did some appliance boot timings of libvirt vs direct qemu boot from
> libguestfs, and essentially libvirt makes no measurable difference,
> which is all good news.

Oh, I'm a little surprised at that. When I switched my KVM
sandbox hacks from a quick proof of concept, over to using
libvirt, I saw about a 300-500ms overhead from libvirt in
the startup process. My presumption is that this overhead
is primarily from libvirt invoking qemu -help several times
to figure out supported options. When we switch to caching
that info though, I'd expect there to be little measurable
impact from libvirt

Daniel
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