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

[Alon Levy]

On Wed, Jan 18, 2012 at 11:39:13AM +0100, Dominique Rodrigues wrote:
> Le 18/01/2012 11:32, Alon Levy a écrit :
> >On Wed, Jan 18, 2012 at 11:27:14AM +0100, Dominique Rodrigues wrote:
> >>Le 18/01/2012 11:18, Alon Levy a écrit :
> >>>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.
> >>>
> >>I installed qxl driver from freedesktop.org :
> >>
> >># wget -c http://xorg.freedesktop.org/releases/individual/driver/xf86-video-qxl-0.0.16.tar.bz2
> >># tar xvfj xf86-video-qxl-0.0.16.tar.bz2
> >># cd xf86-video-qxl-0.0.16
> >># ./configure --libdir=/usr/lib64 --prefix=/usr CFLAGS='-O3'
> >># make
> >># make install
> >>
> >>Do you mean that I should use CFLAGS with "-g" ?
> >I think that's it, yes.
> >
> Ok. So how do you profile debug messages afterwhile ?
> 
> If I "tail -f /var/log/Xorg.0.log", the only message I got is :
> 
>  Bad bpp: 1 (1)
> 
> Other messages look standard.
> 

Right, that's not interesting. What I meant was:

# yum install perf
# perf top
copy paste the top entries.

> >>>>>>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.rodrigues at 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 at 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.rodrigues at 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
> >>>>
> >>>
> >>>
> >>>>_______________________________________________
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> >>>>Spice-devel at 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.rodrigues at 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
> >>
> >
> >

> begin:vcard
> fn:Dominique Rodrigues
> n:Rodrigues;Dominique
> org:nanoClouD
> adr:;;8, rue Lemercier;Paris;;75017;France
> email;internet:dominique.rodrigues at 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
> 




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