On Wed, 2012-01-18 at 10:44 +0200, Alon Levy wrote: > 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? <snip> I believe I had reported a similar issue many months go where just about any X activity drove our Fedora based CPU through the roof though Windows was fine. At the time, I thought you mentioned it was a driver issue - John
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