Messages in this thread | | | Subject | Re: [PATCH 3/4] sched: introduce synchronized idle injection | From | Arjan van de Ven <> | Date | Wed, 18 Nov 2015 07:51:47 -0800 |
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On 11/18/2015 7:44 AM, Morten Rasmussen wrote: > I would not necessarily want to punish all cpus > system-wide if we have local overheating in one corner. If would rather > have it apply to only the overheating socket in a multi-socket machine > and only the big cores in a big.LITTLE system.
most of the time thermal issues aren't inside the SOC, but on a system level due to cheap heat spreaders or outright lack of space due to thinness. But even if you have one part of the die too hot:
For core level idle injection, no need to synchronize that; the reason to synchronize is generally that when ALL cores are idle, additional power savings kick in (like memory going to self refresh, fabrics power gating etc); those additional power savings are what makes this more efficient than just voltage/frequency scaling at the bottom of that range... not so much the fact that things are just idle.
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