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

[Dominique Rodrigues]

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.

>>>>>> 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
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>>>
>>>
>>>> _______________________________________________
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>> 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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