[sugar] rendering test

[Bernie Innocenti]

Tomeu Vizoso wrote:
> Ooops. cc'ing to some other people/list in the hope someone more
> knowledgeable than me will comment.

Thanks.  Please Cc me on posts like these to make sure I don't miss them. 
  No, it doesn't bother me to receive 0.001% more mail.

I've also Cc'd the Xorg list in case someone can give us more insight.


> On Sun, Sep 28, 2008 at 12:46 PM, Riccardo Lucchese
> <riccardo.lucchese at gmail.com> wrote:
>> On Sun, 2008-09-28 at 12:43 +0200, Riccardo Lucchese wrote:
>>> * build 703, xorg driver = amd, redraws = 200
>>> - pixbuf:
>>>   98.63s
>>>   96.96s
>>>   96.58s
>>>   97.14s
>>>   99.21s
>>>
>>> * build 703, xorg driver = fbdev, redraws = 200
>>> - pixbuf:
>>>   55.81s
>>>   55.40s
>>>   55.22s
>>>   55.50s
>>>   55.63s
>>>
>>> * build 2489, xorg driver = amd, redraws = 200
>>> - pixbuf:
>>>   84.21s
>>>   84.81s
>>>   81.94s
>>>   81.79s
>>>   85.29s
>>>
>>> * build 2489, xorg driver = fbdev, redraws = 200
>>> - pixbuf:
>>>   62.83s
>>>   62.81s
>>>   62.81s
>>>   62.66s
>>>   63.14s
>>>
>>> - joyride regressed sensibly at rendering with cairo since 703
>>> - rendering pixbufs is extremely slow on the xo
>>> - server side surfaces are awesome ;)
>>>
>> and btw why is fbdev faster than the geode driver at rendering pixbufs ?

Was fbdev running with EXA or XAA?  (does fbdev even support EXA?)

My performance tests with X 1.3 and 1.4 had shown that turning on EXA 
makes many operations slower.  It's hard to tell why, but it might have to 
do with loosing XShmPut() (MIT shared memory), excessive migration of 
pixmaps to the framebuffer, and so on.  X 1.5 was supposed to have a much 
better EXA, at least judging from the stream of patches landed on the tree.

I'd be very interested in seeing the output of oprofile while running your 
benchmark on X 1.4 and X 1.5.  Please, remember to install the debuginfo 
packages for the X server, libcairo, and the geode driver.

-- 
    \___/  Bernie Innocenti - http://www.codewiz.org/
   _| X |  Sugar Labs Team  - http://www.sugarlabs.org/
   \|_O_|  "It's an education project, not a laptop project!"