lowest C-state changes

[Ivan Klymenko]

В Thu, 5 Apr 2012 10:10:30 -0700
Любомир Григоров <nm.knife at gmail.com> пишет:

> > Have you checked http://wiki.freebsd.org/TuningPowerConsumption?
> I have. It was kind of confusing and didn't know about:
> > 1. For CX states to function correctly you better disable throttling
> > and powerd. I also witnessed at least one machine that hitting any
> > CX mode stops generate interrupts on APIC clock (I had to boot it
> > with a mousee until I disabled APIC clocks).
> So do you recommend I use throttling or C3? I think C3 runs slightly
> cooler. I can't tell since I don't drop under 50C in X. Fan increases
> at 60C and drops me back.
> 
> > 2. You don't need to set each processor CX value, you only need to
> > set:
> >
> > hw.acpi.cpu.cx_lowest=C3
> >
> > All cpu's will inherit default profile.
> >
> Thanks.
> 
> > First need to see what state the processor supports the current
> > system
> >sysctl -a | grep cx_
> This is before heavy load while it still remembers the C3:
> 
> hw.acpi.cpu.cx_lowest: C1
> dev.cpu.0.cx_supported: C1/1 C2/80 C3/109
> dev.cpu.0.cx_lowest: C3
> dev.cpu.0.cx_usage: 0.89% 0.77% 98.32% last 47us
> dev.cpu.1.cx_supported: C1/1 C2/80 C3/109
> dev.cpu.1.cx_lowest: C3
> dev.cpu.1.cx_usage: 3.30% 3.18% 93.50% last 3852us
> dev.cpu.2.cx_supported: C1/1 C2/80 C3/109
> dev.cpu.2.cx_lowest: C3
> dev.cpu.2.cx_usage: 2.95% 1.42% 95.61% last 293us
> dev.cpu.3.cx_supported: C1/1 C2/80 C3/109
> dev.cpu.3.cx_lowest: C3
> dev.cpu.3.cx_usage: 2.73% 1.55% 95.71% last 8471us
> 
> After lowest becomes C1, all 4 cores are 100% C1. So I have to
> manually set back, or disable powerd or C states. I prefer powerd,
> tbh, so please recommend what I should use.
> 
> Cheers.
> 

sysctl hw.acpi.acline - changes its value when disconnecting the power
supply to the laptop?