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

Matthew Dillon dillon at
Mon Dec 8 12:51:07 PST 2014

:>> 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  

    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.

					Matthew Dillon 
					<dillon at>

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