Re: [Libguestfs] [libvirt] [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