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

[Dominique Rodrigues]

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)

>> Regards,
>>
>> -- 
>>
>>
>>         Dominique Rodrigues
>>
>> nanoClouD<http://www.nanocloud.com>
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>
>
>
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