On 09/18/2012 05:30 AM, Youquan Song wrote:
>>> One case is turbostat utility (tools/power/x86/turbostat) at kernel 3.3 or
>>> early
>>> . turbostat utility will read 10 registers one by one at Sandybridge, so it
>>> will
>>> generate 10 IPIs to wake up idle CPUs. So cpuidle menu governor will
>
> > One case is turbostat utility (tools/power/x86/turbostat) at kernel 3.3 or
> > early
> > . turbostat utility will read 10 registers one by one at Sandybridge, so it
> > will
> > generate 10 IPIs to wake up idle CPUs. So cpuidle menu governor will
> > predict it
> > is repeat mode and there
On 09/18/2012 03:53 AM, Youquan Song wrote:
> The prediction for future is difficult and when the cpuidle governor
> prediction
> fails and govenor possibly choose the shallower C-state than it should. How
> to
> quickly notice and find the failure becomes important for power saving.
>
> c
The prediction for future is difficult and when the cpuidle governor prediction
fails and govenor possibly choose the shallower C-state than it should. How to
quickly notice and find the failure becomes important for power saving.
cpuidle menu governor has a method to predict the repeat pat
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