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Thread: Ondemand vs. Performance CPU Governing For AMD FX CPUs On Linux 3.17

  1. #11
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    Quote Originally Posted by tomtomme View Post
    Do I have to restart the PC or is it applied immediately?
    Immediately.

    it doesn't persist across boots, so you should put it in a startup script to run after every boot (very much distro-dependant)

  2. #12
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    Quote Originally Posted by grigi View Post
    Immediately.

    it doesn't persist across boots, so you should put it in a startup script to run after every boot (very much distro-dependant)
    thanks!
    did some testing with the witcher 2 port and it helped!

  3. #13
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    Did you try and post images? I have some png file names in the email.

  4. #14
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    Quote Originally Posted by grigi View Post
    Did you try and post images? I have some png file names in the email.
    default settings 95 and 1


    15 and 100



    HD 7950 core2quat @ 3ghz
    radeonSI, Mesa 10.4, llvm3.6svn, hyperz, kernel 3.16.1
    FPS graphs / screenshots from GALLUM_HUD after easy arena fight in the witcher 2 beta 5;
    low settings, GL 3.2, 1080p, vsync
    Last edited by tomtomme; 09-03-2014 at 05:06 AM.

  5. #15
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    Iíve also been using up_threshold = 50 and sampling_down_factor = 10 for a long time on my Core i3*. It used to make Flash behave correctly several years ago, and recently Iíve also seen that it makes ondemand very close to performance in terms of FPS for The Witcher 2, while the default 95/1 makes you lose 5-10% in FPS.
    [*] First gen Core i processors do not use intel_pstate.

  6. #16
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    Quote Originally Posted by tomtomme View Post
    default settings 95 and 1


    15 and 100



    HD 7950 core2quat @ 3ghz
    radeonSI, Mesa 10.4, llvm3.6svn, hyperz, kernel 3.16.1
    FPS graphs / screenshots from GALLUM_HUD after easy arena fight in the witcher 2 beta 5;
    low settings, GL 3.2, 1080p, vsync
    Iím surprised there is so little difference. Perhaps your GPU and video driver are the limiting factor and you should reduce the resolution and disable vsync to better see the impact of the ondemand settings.

  7. #17
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    Quote Originally Posted by stqn View Post
    Iím surprised there is so little difference. Perhaps your GPU and video driver are the limiting factor and you should reduce the resolution and disable vsync to better see the impact of the ondemand settings.
    little? I would guess thats a 20% improvement. Pretty impressive without buying new hardware...
    sadly I canīt disable vsync makes because in video sequences then I have several 100 fps and that makes the graph unreadable because I do not know how to limit its fps maximum / scale.

  8. #18
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    Quote Originally Posted by tomtomme View Post
    little? I would guess thats a 20% improvement.
    Ah well, all I*see in these graphs is you get 61 FPS with the default settings and only 60 with the optimized settingsÖ

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