On Wed, 16 Jun 2010, Jason Chagas wrote:
> > powersave (can sacrifice measurable performance)
> > scheduler: enable sched_smt_power_savings
> > cpuidle: enable all C-states, subject to QOS
> > ondemand: disable turbo mode, powersave_bias=10
> > msr_ia32_energy_perf_bias: 11 of 15
> >
>
> Do you have any pointers to info (or code) on how the different
> C&P-states are selected within each level?
I'm not proposing any changes to how the cpuidle menu govenor
selects C-states, or how it obeys PM_QOS, except for 1 thing.
I am proposing that in "max_performance" mode that C-states
be disabled entirely, to avoid any state latency whatsoever.
thanks,
Len Brown, Intel Open Source Technology Center
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