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

Dominique Rodrigues dominique.rodrigues at nanocloud.com
Wed Jan 18 02:59:45 PST 2012 

Le 18/01/2012 11:48, Alon Levy a écrit :
> 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.
>
Ok, that's it (from a screenshot of the VM):

samples    pcnt    function        DSO

3796.00        60.4%    hashlittle                    
/usr/lib64/xorg/modules/drivers/qxl_drv.so
2014.00        32.1%    __memcpy_ssse3      /lib64/libc-2.12.so
341.00            5.4%    download_box           
/usr/lib64/xorg/modules/drivers/qxl_drv.so
61.00               1.0%    __memset_sse2        /lib64/libc-2.12.so
11.00               0.2%    qxl_ring_push           
/usr/lib64/xorg/modules/drivers/qxl_drv.so
10.00               0.2%    finish_task_switch    [kernel.kallsyms]
8.00                 0.1%    qxl_allocnf                
/usr/lib64/xorg/modules/drivers/qxl_drv.so
8.00                 0.1%    retint_careful            [kernel.kallsyms]
6.00                 0.1%    hash_and_copy        
/usr/lib64/xorg/modules/drivers/qxl_drv.so

>>>>>>>> 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
>>>>>>
>>>>>
>>>>>> _______________________________________________
>>>>>> 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
>>>>
>>>
>> 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
-------------- next part --------------
A non-text attachment was scrubbed...
Name: dominique_rodrigues.vcf
Type: text/x-vcard
Size: 296 bytes
Desc: not available
URL: <http://lists.freedesktop.org/archives/spice-devel/attachments/20120118/d617dd0b/attachment.vcf>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/pkcs7-signature
Size: 3710 bytes
Desc: S/MIME Cryptographic Signature
URL: <http://lists.freedesktop.org/archives/spice-devel/attachments/20120118/d617dd0b/attachment.bin>

More information about the Spice-devel mailing list