On 11/5/2015 2:09 AM, Peter Zijlstra wrote:
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.
idle injection is a last ditch effort in thermal management, before this gets used the hardware already has clamped you to a low frequency, reduced memory speeds, probably dimmed your screen etc etc. at this point there are 3 choices 1) Shut off the device 2) do uncoordinated idle injection for 40% of the time 3) do coordinated idle injection for 5% of the time as much as force injecting idle in a synchronized way sucks, the alternatives are worse.
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