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glxgears faster with powersave mode

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  • glxgears faster with powersave mode


    I know glxgears is not a benchmark, but this behaviour feels strange.
    Running Ubuntu 8.10 and fglrx on a radeon hd 3430 and playing with cpu throttling modes, I get :

    with powersave mode:
    15623 frames in 5.0 seconds = 3124.463 FPS
    15640 frames in 5.0 seconds = 3127.870 FPS
    15625 frames in 5.0 seconds = 3124.844 FPS
    cpu load is 16%

    with performance mode:
    4978 frames in 5.0 seconds = 995.586 FPS
    5002 frames in 5.0 seconds = 1000.375 FPS
    5001 frames in 5.0 seconds = 1000.199 FPS
    cpu load is 97%

    so I get three times less performance using a supposedly powersaving mode. Does anybody know why? It's not a problem, just curiosity though...

  • #2
    Well, like you said glxgears is not a benchmark. If you think something is actually wrong, then it might be a good idea to run some of the phoronix test suite benchmarks on it to see if you can duplicate the problem using real benches.


    • #3
      is it possible that while you tested it in performance mode, something else was running.
      Seems odd that you would have 97% load from glxgears

      Funny thing is when I just tested it, my cpu load was <5%, but if i moved my mouse it jumped to 50% (100% on one core). once I stopped moving my mouse it went back down.