[OmniOS-discuss] [discuss] illumos power management

[Rafael Vanoni]

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