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Thread: Radeon Driver Power Management Has Room For Improvement

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  1. #1
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    Default Radeon Driver Power Management Has Room For Improvement

    Phoronix: Radeon Driver Power Management Has Room For Improvement

    Today on Phoronix are not only new benchmarks of the proprietary Catalyst graphics driver compared to the open-source Radeon Linux driver alternative when looking at the OpenGL frame-rates, but also metrics on a number of other fronts. In this article is a graphics driver comparison when looking at the system power consumption, GPU operating temperature, and CPU usage too. The results are quite interesting and not commonly looked at on Phoronix or by users.

    http://www.phoronix.com/vr.php?view=16182

  2. #2
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    Feb 2011
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    What I found the most interesting in these graphs is the idle power management.

    I'd always thought that my graphics card (5870) was using much more power with radeon than it would with catalyst (never tried it though).

    According to this, that isn't necessarily the case.

    Thanks for the benchmarks.

    David

  3. #3
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    Quote Originally Posted by Welsh Dwarf View Post
    What I found the most interesting in these graphs is the idle power management.
    Without catalyst temperatures I do agree.

    It seems every card is a different story. Dynpm did not work for your cards, but it works with my HD3870. Low profile did not work for HD4870, but it works flawlessly for the others.

    Anyway it seems power management is in good shape, we just need more testing and a better dynpm which can be enabled by default.

  4. #4
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    The other thing I find bizzar is that according to the DRM, my card doesn't have a low profile (or at least, it's the same as mid) but according to the benchmarks (comparing voltage) it's the mid profile that my card is lacking.

    Being on a laptop, these things have increased importance.

    David

  5. #5
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    Thanks Michael, very interesting. Seems the biggest conclusion is that dynpm doesn't work, period.

  6. #6
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    May 2011
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    Default DynPM does work, but not well...

    I have a HD 5400 card, and with power management set to DynPM, it switches between High profile en Mid profile.
    Problems (black screens) occur with refreshes of the screen on lower (low, mid) profiles because of sync problems.
    High profile makes the card hot, and makes the fan spin loudly even when your compositing desktop is not doing anything.

  7. #7
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    Quote Originally Posted by Welsh Dwarf View Post
    The other thing I find bizzar is that according to the DRM, my card doesn't have a low profile (or at least, it's the same as mid) but according to the benchmarks (comparing voltage) it's the mid profile that my card is lacking.

    Being on a laptop, these things have increased importance.

    David
    How do you see this ?

  8. #8
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    Feb 2011
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    Quote Originally Posted by whitecat View Post
    How do you see this ?
    /sys/kernel/debug/dri/0/radeon_pm_info

    You need debugfs mounted.

    HTH

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