[Spice-devel] Question about poor performance of Ubuntu VMs

[Alon Levy]

> Greetings,
> 
> I'm a big Red Hat / clone slash Fedora guy... and I use use a lot of
> KVM.  I primarily create Fedora, RHEL/clone, and Windows KVM guests
> and they work great... but every once in a while I like to try out
> an Ubuntu release just to see what's new.  I have tried their Unity
> spin as well as their Xubuntu spin... for a few releases now.  I'd
> expect Unity to be slow because it is similar to GNOME 3 in that it
> wants to do that 3D stuff.  But with Xubuntu and XFCE, I'd expect it
> to be snappy.  That has NOT been my experience.  It is really slow.
>  Moving a window around is extremely choppy and it can even lag out
> (where it doesn't respond at all) for periods of time.  I haven't
> done much troubleshooting of this but I have done a few installs on
> a variety of hardware (for the host node) and used a variety of
> client machines and the pokey experience has been the same.
> 
> I suspect it has something to do with the mouse emulation used
> because the Xubuntu desktop seems to perform fairly well until the
> mouse is moved.
> 
> Any ideas?  Maybe there is some configuration change either in KVM or
> in Xubuntu that will improve the situation.  I use virt-manager to
> create the guests (on Fedora and RHEL) and pick the closest Ubuntu
> version listed.

So on the same host a fedora vm works fast but the ubuntu is slow? I suspect the driver is not installed or not recognized in the ubuntu vm. Can you provide the X log?

> 
> TYL,
> --
> Scott Dowdle
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