Messages in this thread | | | Date | Fri, 6 Nov 2015 11:18:38 -0800 | From | Jacob Pan <> | Subject | Re: [RFC PATCH 0/3] CFS idle injection |
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On Fri, 06 Nov 2015 16:50:15 +0000 Punit Agrawal <punit.agrawal@arm.com> wrote:
> * idle injection once frequencies have been capped to the lowest > feasible values (as suggested in the cover letter) > actually, I was suggesting to start considering idle injection once frequency capped to the energy efficient point, which can be much higher than the lowest frequency. The idea being, deep idle power is negligible compared to running power which allows near linear power-perf scaling for balanced workload. Below energy efficient frequency, continuous lowering frequency may lose disproportion performance vs. power. i.e. worse than linear.
> One question about the implementation in these patches - should the > implementation hook into pick_next_task in core instead of CFS? Higher > priority tasks might get in the way of idle injection. My take is that RT and throttling will never go well together since they are conflicting in principle.
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