Re: [PATCH 1/7] sched: Introduce scale-invariant load tracking

From: Peter Zijlstra
Date: Fri Oct 10 2014 - 05:07:52 EST

On Wed, Oct 08, 2014 at 01:38:40PM +0200, Vincent Guittot wrote:
> I have in mind some system where the max achievable freq of a core
> depends of how many cores are running simultaneously because of some
> HW constraint like max current. In this case, the CPU might not reach
> max frequency even with an always running task.
> Then, beside frequency scaling, their is the uarch invariance that is
> introduced by patch 4 that will generate similar behavior of the load.

This is a 'common' issue. x86 and powerpc also suffer this. It can be
the result of either thermal or power thresholds.

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