Poor composting performance in KDE 4.3

[James Tyrer]

Nikos Chantziaras wrote:
> On 10/16/2009 07:14 AM, James Tyrer wrote:
>> Nikos Chantziaras wrote:
>>> On 10/16/2009 02:01 AM, Dotan Cohen wrote:
>>>>> Which drivers are you using?  If you use AMD Catalyst (Ubuntu calls them
>>>>> "restricted"), you need to make sure you run the latest version, 9.10
>>>>> Ubuntu beta:
>>>>>
>>>>>     http://www.phoronix.com/scan.php?page=news_item&px=NzUxNA
>>>>>
>>>>> Old version have plenty of bugs with compositing.
>>>>>
>>>> Interesting, thanks. I recently saw an article on Phoronix where the
>>>> FOSS driver beat the proprietary driver in almost every benchmark.
>>> For 2D.  3D with FOSS drivers is a few light-years behind Catalyst right
>>> now, unfortunately.
>>>
>> Well, yes and no.  There is still a strange issue with the "radeon"
>> driver (as of the date [unknown] of the man page I have); the 3D
>> acceleration only works with the older chips.  So, it works fine on my
>> old RV280 based board (Radeon 9200) but there isn't/wasn't any 3D
>> acceleration for the  RS780 chip (HD 3200).  I don't know if this is
>> going to be ported to the newer chips now that the documentation is
>> available or if the work will be only on the somewhat experimental
>> "radeonhd" driver which doesn't have 3D acceleration yet.
> 
> I was referring to performance, not whether it works at all or not.  3D 
> apps with FOSS drivers run with less than half the speed of the binary 
> driver (I'd say about 20% to 30%).  Power management is also bad.  But 
> if you're not interested in 3D performance, they're just fine and will 
> get better over time (give them another year or so.)
> 
Do you have a citation for this "information".  The part of the driver 
(including 3D) which is based on (pre-AMD) ATI documentation has been 
around for several years so what you stated does not make much sense.

-- 
James Tyrer

Linux (mostly) From Scratch
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