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

[David Jaša]

Alon Levy píše v St 18. 01. 2012 v 12:18 +0200:
> 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.
> 

Alon, is there similar procedure for Windows guests? I guess something
like this would help tracking down Autocad performance issues.

David

> > 
> > >>Regards,
> > >>
> > >>-- 
> > >>
> > >>
> > >>        Dominique Rodrigues
> > >>
> > >>nanoClouD<http://www.nanocloud.com>
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> > >>75017 Paris
> > >>France
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> > >>529 002 743 R.C.S. Paris
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> > >>email;internet:dominique.rodrigues at nanocloud.com
> > >>title:Directeur Technique
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> > >>url:www.nanocloud.com
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> > >>
> > >
> > >
> > >
> > >>_______________________________________________
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> 
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> > org:nanoClouD
> > adr:;;8, rue Lemercier;Paris;;75017;France
> > email;internet:dominique.rodrigues at nanocloud.com
> > title:Directeur Technique
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> > 
> 
> 
> 
> 
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-- 

David Jaša, RHCE

SPICE QE based in Brno
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