On Wed, Jan 18, 2012 at 09:54:49AM +0100, Dominique Rodrigues wrote: > > Le 18/01/2012 09:44, Alon Levy a écrit : > >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? > > > > Indeed, during the drawing in Gimp, Xorg takes between 55% and 66% of CPU. > > After, Xorg goes down to 0.3%. > > (Test done on CentOS 6.2 guest, with 1280 Mb vRAM)
ok, can you drill down - you should be able to install the debug symbols for the qxl driver (xorg-x11-drv-qxl package) and see the specific functions that are taking the most time. > > >>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 > >>begin:vcard > >>fn:Dominique Rodrigues > >>n:Rodrigues;Dominique > >>org:nanoClouD > >>adr:;;8, rue Lemercier;Paris;;75017;France > >>email;internet:dominique.rodrig...@nanocloud.com > >>title:Directeur Technique > >>tel;work:+33 (0) 1 77 69 64 38 > >>tel;cell:+33 (0) 6 28 52 37 70 > >>url:www.nanocloud.com > >>version:2.1 > >>end:vcard > >> > > > > > > > >>_______________________________________________ > >>Spice-devel mailing list > >>Spice-devel@lists.freedesktop.org > >>http://lists.freedesktop.org/mailman/listinfo/spice-devel > begin:vcard > fn:Dominique Rodrigues > n:Rodrigues;Dominique > org:nanoClouD > adr:;;8, rue Lemercier;Paris;;75017;France > email;internet:dominique.rodrig...@nanocloud.com > title:Directeur Technique > tel;work:+33 (0) 1 77 69 64 38 > tel;cell:+33 (0) 6 28 52 37 70 > url:www.nanocloud.com > version:2.1 > end:vcard > > _______________________________________________ > Spice-devel mailing list > Spice-devel@lists.freedesktop.org > http://lists.freedesktop.org/mailman/listinfo/spice-devel _______________________________________________ Spice-devel mailing list Spice-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/spice-devel
