Poor composting performance in KDE 4.3

[Nikos Chantziaras]

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.)

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