[Spice-devel] Delay in Gimp when using qxl driver

[Alon Levy]

On Wed, Jan 18, 2012 at 08:06:40AM +0100, Dominique Rodrigues wrote:
> Hi,
> 
> Since I use qxl driver in virtual desktop powered by qemu-kvm, I
> found a strange problem with Gimp.
> 
> After launching Gimp, open a new windows, and then try to draw
> something. It appears that the drawing is very slow and does not
> follow the mouse at all.
> 
> It is the same if I use spicy, spicec or vnc to connect to my
> virtual desktop.
> 
> This problem does not appear with cirrus or vmware graphic drivers.
> 
> I found that on any Linux distribution (CentOS, RHEL, Scientific
> Linux, Debian, Ubuntu).
> 
> I currently use :
> - qemu-kvm 1.0 compiled with spice support
> - spice-protocol 0.10.1
> - spice 0.10
> - spice-gtk 0.7
> - xorg-qxl driver 0.16
> 
> Is there any explanation for that ?

I would assume it is qxl driver cpu bound on something, probably busy
waiting on the command ring. Can you run perf top on the guest?

> 
> Regards,
> 
> -- 
> 
> 
>        Dominique Rodrigues
> 
> nanoClouD <http://www.nanocloud.com>
> 8, rue Lemercier
> 75017 Paris
> France
> standard : +33 1 77 69 64 38
> 529 002 743 R.C.S. Paris

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