Critical power slope: understanding the runtime effects of frequency scaling
ICS '02 Proceedings of the 16th international conference on Supercomputing
Koala: a platform for OS-level power management
Proceedings of the 4th ACM European conference on Computer systems
Green governors: A framework for Continuously Adaptive DVFS
IGCC '11 Proceedings of the 2011 International Green Computing Conference and Workshops
The forgotten 'uncore': on the energy-efficiency of heterogeneous cores
USENIX ATC'12 Proceedings of the 2012 USENIX conference on Annual Technical Conference
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Energy management is a primary consideration in the design of modern smartphones, made more interesting by the recent proliferation of multi-core processors in this space. We investigate how core offlining and DVFS can be used together on these systems to reduce energy consumption. We show that core offlining leads to very modest savings in the best circumstances, with a heavy penalty in others, and show the cause of this to be low per-core idle power. We develop a policy in Linux that exploits this fact, and show that it improves up to 25% on existing implementations.