Re: [PATCH 1/3] Added runqueue clock normalized with cpufreq

[Peter Zijlstra]

On Fri, 2010-12-17 at 16:06 +0100, Harald Gustafsson wrote:
> 2010/12/17 Peter Zijlstra <peterz@xxxxxxxxxxxxx>:
> > This is all assuming lowering the frequency is sensible to begin with in
> > the first place... but that's all part of the CPUfreq governor, it needs
> > to find a way to lower energy usage while conforming to the system
> > constraints.
> 
> Yes, I and you have already suggested the safe way to not lower it below
> the total dl bandwidth. But for softer use cases it might be possible to
> e.g. exclude threads with longer periods than cpufreq change periods in the
> minimum frequency.

I was more hinting at the fact that CPUfreq is at best a controversial
approach to power savings. I much prefer the whole race-to-idle
approach, its much simpler.
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