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Thread: Abysmal compositing performance with VSync enabled

  1. #1
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    Default Abysmal compositing performance with VSync enabled

    I had to watch two videos at once with mplayer (to visually compare them). Doing that revealed that fglrx is *slower* than molasses when having two opengl apps run at the same time with VSync enabled in a compositing environment (KDE 4).

    So I tried running several instances of glxgears at once. Even with just two, the lag becomes intolerable. Add a third, and you feel like running Windows Vista on a 486.

    Disabling VSync makes everything super-fluid again.

    Is this normal and will we have to live with it? It sucks.

  2. #2
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    I had 13 glxgears windows running with compositing (compiz-fusion) and no lags with VSYNC (in compiz) enabled!

    tweak your cpu-scheduler / CFS and probably switch to compiz ?

  3. #3
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    I just tested this as well and get the fps drop with only two glxgears running if Vsync is set in amdcccle. In compiz settings everything is fine.

  4. #4
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    Quote Originally Posted by kernelOfTruth View Post
    I had 13 glxgears windows running with compositing (compiz-fusion) and no lags with VSYNC (in compiz) enabled!
    Not in Compiz. That doesn't work with fglrx anyway. You have to enable it in CCC (amdcccle).

  5. #5
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    Quote Originally Posted by RealNC View Post
    Not in Compiz. That doesn't work with fglrx anyway. You have to enable it in CCC (amdcccle).
    found it & confirmed !

    can this be fixed with the official Catalyst 9.10 ?

    Many thanks in advance

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