Acer c720 machdep.mwait.CX.[idle, spin]

[Sepherosa Ziehau]

On Tue, Dec 9, 2014 at 4:51 AM, Matthew Dillon
<dillon at apollo.backplane.com> wrote:
> :>> Also suggested in /etc/sysctl.conf:
> :>>
> :>>     hw.cpu_mwait_halt=0x44
> :>>     hw.cpu_mwait_spin=0x11
> :>
> :> Now these sysctls are read-only. Which C-states I must use with
> :> machdep.mwait.CX.[idle, spin]?
> :>
> :> machdep.mwait.CX.supported: C1/0 C1/1 C2/0 C3/0 C3/1 C4/0 C4/1 C4/2 C4/3
> :> C5/0 C6/0 C7/0
> :
> :Tried machdep.mwait.CX.idle=AUTODEEP?
> :
> :The sysctl machdep.mwait output should tell you how often each state was
> :entered.
> :
> :Sascha
>
>     Yah.  The original settings for mwait_halt/spin were manual settings
>     before sephe added the cpu autoprobing for the modes.  Those are now
>     read-only.  Now you just set it to AUTODEEP as you have above.

You could optionally set it to any values listed in
machdep.mwait.CX.supported, e.g. C7/0

Best Regards,
sephe


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