OS X & and its EIST (un)support

Discussion in 'Mac OS X Lion (10.7)' started by meme1255, Jul 16, 2012.

  1. meme1255, Jul 16, 2012
    Last edited: Jul 16, 2012

    meme1255
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    macrumors 6502

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    #1
    Hello,
    I am making small research about EIST support in OS X - please, insert in Terminal this commands :
    sysctl hw.cpufrequency_min
    sysctl hw.cpufrequency_max
    sysctl hw.cpufrequency

    and post here what it prints.

    Thank you ;)

    My example:

    MBP:~ Martin$ sysctl hw.cpufrequency_min
    hw.cpufrequency_min: 2530000000
    MBP:~ Martin$ sysctl hw.cpufrequency_max
    hw.cpufrequency_max: 2530000000
    MBP:~ Martin$ sysctl hw.cpufrequency
    hw.cpufrequency: 2530000000
     
  2. meme1255
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  3. Mal
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    macrumors 603

    Mal

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    Orlando
  4. meme1255
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    #4
    Well... Thank you ;)

    It really looks like Apple DOES NOT use CPU-Powersaving technologies.. WHY?!
    (Or the terminal is lying, but i don't think so)
     
  5. appletechpro, Jul 16, 2012
    Last edited: Jul 16, 2012

    appletechpro
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    macrumors regular

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    Jun 26, 2012
    #5
    I think you are mistaken, and I wouldn't read too much into those sysctl values -- the newer CPUs obviously have TurboBoost and are advertised by Apple as such:

    http://ark.intel.com/products/52219/Intel-Core-i7-2630QM-Processor-(6M-Cache-up-to-2_90-GHz)

    EDIT: I included that information to illustrate that OS X obviously supports frequency scaling, but upon further review it appears there is conflicting information on the 'net. Wikipedia states SpeedStep support has been built-in the Darwin kernel since OS X Tiger, but there don't appear to be any recent confirmations of SpeedStep actually being utilized by Apple and the sysctl values in OS X are not modifiable.

    My guess is that OS X had SpeedStep support built-in to the kernel for good measure, and it probably hasn't been utilized by Apple in most of their products or possibly even at all.
     
  6. meme1255
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    #6
    It looks like Tiger supported it, but then it was removed ( and XNU don't contain speed step support, so Wiki is not accurate.)
     
  7. meme1255, Jul 17, 2012
    Last edited: Jul 17, 2012

    meme1255
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    #7
    Appears like SL don't support EIST, too :(

    hw.cpufrequency_min: 2530000000
    :confused::eek:
     

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