# [OmniOS-discuss] [discuss] illumos power management

Rafael Vanoni rafael.vanoni at pluribusnetworks.com
Thu Nov 14 18:33:23 UTC 2013

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    On Wed, Nov 13, 2013 at 7:38 PM, Paul B. Henson <henson at acm.org> wrote:
    [snip]
    > Is there any way to tell what it ended up doing? I assume my box is new
    > enough to support event mode, but you never know if the bios has broken ACPI
    > data 8-/...

    Try

    # echo "cpupm::print" | mdb -k

    > The options for cpu_deep_idle seem a bit confusing, there is "default" which
    > says "Advanced  cpu  idle  power  saving  features  are enabled on  hardware
    > which  supports it", and "enable", which says "Enables the system to
    > automatically use idle cpu power saving features" -- I'm not clear what the
    > difference is here. You can't really enable a feature on hardware that
    > doesn't support it ;). The third option "disable" makes sense, it won't do
    > it regardless of whether or not the hardware could. Evidently if you don't
    > specify it at all it defaults to "default", overall it seems it would be
    > simpler for the only option for this parameter to be "disabled"; either it
    > will do it if it can, or it won't do it at all if you tell it not to.
    >
    > Thanks…

    I think the default option refers to when you don't specify
    cpu_deep_idle at all, which is equivalent to having it and 'enable'.
    If you enable and the hardware doesn't support it, the OS falls back
    to whatever it can.

    Rafael

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