Messages in this thread | | | Date | Thu, 5 Nov 2015 11:27:32 -0800 | From | Jacob Pan <> | Subject | Re: [RFC PATCH 3/3] sched: introduce synchronized idle injection |
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On Thu, 5 Nov 2015 11:09:22 +0100 Peter Zijlstra <peterz@infradead.org> wrote:
> > Before: > > CPU0 ______||| || |___________| || || |_____ > > CPU1 _________||| || |_______| || |_______ > > > > After: > > > > CPU0 ______||| || |___________| || || |_____ > > CPU1 ______||| || |___________| || |_______ > > > > The goal is to have overlapping idle time if the load is already > > balanced. The energy saving can be significant. > > I can see such a scheme having a fairly big impact on latency, esp. > with forced idleness such as this. That's not going to be popular for > many workloads. agreed, it would be for limited workload. the key is to identify such workloads at runtime. I am thinking to use the load average of the busiest CPU as reference for consolidation, will not go beyond that. For the patch I have today and if you play a game like this one http://www.agame.com/game/cut-the-rope
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