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

Dominique Rodrigues dominique.rodrigues at nanocloud.com
Sun Jan 22 09:33:59 PST 2012 

Le 22/01/2012 18:28, Alon Levy a écrit :
> On Sun, Jan 22, 2012 at 05:15:42PM +0200, Alon Levy wrote:
>> On Sun, Jan 22, 2012 at 03:53:40PM +0100, Dominique Rodrigues wrote:
>>> Le 22/01/2012 16:00, Alon Levy a écrit :
>>>> On Fri, Jan 20, 2012 at 02:04:47PM -0500, Yaniv Kaul wrote:
>>>>> ----- Original Message -----
>>>>>> On Wed, Jan 18, 2012 at 11:59:45AM +0100, Dominique Rodrigues wrote:
>>>>>>> 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):
>>>>>> Try ssh'ing to the vm, you can then use copy-paste.
>>>>>>
>>>>>>> samples    pcnt    function        DSO
>>>>>>>
>>>>>>> 3796.00        60.4%    hashlittle
>>>>>> This sucks, unfortunately I don't have any quick fix for it. It's the
>>>>>> hash computation done on each image. Needless to say it needs to be
>>>>>> optimized - either made more efficient or reduce the number of calls.
>>>>>>
>>>>>> Soren, FYI.
>>>>> You could move to murmur2, like Windows' QXL driver (https://bugs.freedesktop.org/show_bug.cgi?id=37465) or murmur3 or other faster ones (https://bugs.freedesktop.org/show_bug.cgi?id=35775).
>>>>> At least it's not hashed twice now(https://bugs.freedesktop.org/show_bug.cgi?id=37977 - worth updating bug status?!), but I'm not sure it should be hashed at all, if it's not cached.
>>>>> Y.
>>>> Looks like this could be x6 performance gain when compared to hashlittle
>>>> (lookup3 at http://code.google.com/p/smhasher/). So it would still be
>>>> better not to run it at all but it might stop being the bottleneck. I'll
>>>> try to do a patch.
>>>>
>>> Sounds promising.
>> Actually only 2x since we use a 32bit hash anyway (x86/x64). Still worth
>> a patch.
>>
> Since the hash is not in use right now at all, but commented out, you
> could get an even more remarkable performance improvement by disabling
> it. If you can check the branch at
>
>   git://people.freedesktop.org/~alon/xf86-video-qxl murmur3
>
> You can tell us how much it actually improves for you. I didn't disable
> the hashing, just replaced lookup3 with MurmurHash3 from
> http://code.google.com/p/smhasher/wiki/MurmurHash3.
>

I guess I missed something, because I don't manage to launch the 
X-server now in my CentOS guest.

This what I have done :

# git clone git://people.freedesktop.org/~alon/xf86-video-qxl 
xf86-video-qxl-alon-git
# cd xf86-video-qxl-alon-git
# git checkout murmur3
# git branch
* murmur3
   surface-fixes
# export 
PKG_CONFIG_PATH=/usr/local//share/pkgconfig/:/usr/local/lib/pkgconfig
# ./autogen.sh --libdir=/usr/lib64 --prefix=/usr CFLAGS='-O3'
# make
# make install

Where is my mistake ?


>>>>>>> /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
>>>>>>> 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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