On 06/30/2011 06:28 AM, Duncan wrote:
> Nikos Chantziaras posted on Wed, 29 Jun 2011 23:22:36 +0300 as excerpted:
>
>> (I'm using a Radeon HD4870 with the open source drivers.)
>>
>> I was able to find a tweak that makes kwin usable again though. I had
>> to create a ~/.drirc file and put this in there:
>>
>> <driconf>
>> <device screen="0" driver="dri2">
>> <application name="Default">
>> <option name="vblank_mode" value="0" />
>> </application>
>> </device>
>> </driconf>
>>
>> The "driconf" utility doesn't work; the above has to be created by hand.
>>
>> Also, the "VSync" option in System Settings must be unchecked. Both of
>> these things must be performed; if only the .drirc file is created, or
>> only the VSync checkbox is unchecked, then kwin will keep being slow.
>>
>> It should be noted that the desktop is still tear-free after doing the
>> above.
>
> [...]
> Meanwhile, I'd be interested in your locked and unlocked glxgears
> framerate stats. If you're seeing< 60 Hz even maximized (assuming
> you're not running dual 2560x1600 monitors or some such), then there's
> gotta be something wrong with your effects chain, somewhere, because as I
> said, AFAIK, your hd4870/rv780 should in theory be getting better stats
> than my hd4650/rv730.
I'm getting about 7000 FPS windowed, and 4000FPS maximized (yes, that's
thousands, not hundreds.) But I think glxgears is not pretty good as a
benchmark these days.
> Next thing to try is OpenGL video playback. I wonder if the unlocked
> framerate will affect it any...
If you have SwapbuffersWait disabled, then the effect will be ugly
tearing and higher GPU temps.
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