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Better ACPI, Power Management For Linux 3.12 Kernel

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  • Better ACPI, Power Management For Linux 3.12 Kernel

    Phoronix: Better ACPI, Power Management For Linux 3.12 Kernel

    The Linux 3.12 kernel will feature improvements to ACPI and power management in general thanks to recent developments...

    http://www.phoronix.com/vr.php?view=MTQ1MzA

  • #2
    was not it for the 3.10 and 3.11 kernels ? oh well I guess it's a work in progress for several releases

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    • #3
      cpufreq on demand governor should now choose target frequencies proportionally to load
      What did it do before?

      Btw, does it have a (configurable) hysteresis?

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      • #4
        Originally posted by xnor View Post
        What did it do before?
        It was more like: no load -> min freq, some load -> max freq.

        Originally posted by xnor View Post
        Btw, does it have a (configurable) hysteresis?
        Yes: https://wiki.archlinux.org/index.php...emand_governor

        /edit:
        Just wanted to add: I liked the old way, because that way the task gets finished faster and the cpu can go back to min freq. faster. But this is only true if the task is not some long running program which causes a medium load over a long period of time (e.g. non-desktop loads).
        Last edited by droste; 09-04-2013, 04:08 PM.

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        • #5
          Originally posted by phoronix View Post
          Phoronix: Better ACPI, Power Management For Linux 3.12 Kernel

          The Linux 3.12 kernel will feature improvements to ACPI and power management in general thanks to recent developments...

          http://www.phoronix.com/vr.php?view=MTQ1MzA
          So, no infrastructure progress towards supporting intel smart connect?
          I can see this being low priority since it's not intended for servers, but it would be great for laptops.

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          • #6
            Originally posted by droste View Post
            It was more like: no load -> min freq, some load -> max freq.
            Just adding that idle priority loads did not cause a bump in speed. One could run John on all cores and they would stay at the lowest freq.

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            • #7
              sandy laptop under win8 -> ~160 min moderate use

              sandy laptop under 3.8 -> ~ 100 min moderate use

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