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Energy efficiency is essential to battery-powered (BP) mobile systems. However, existing energy efficiency techniques suffer from imbalance between system performance and power consumption. This paper presents a Feedback QoS based Model, called FQM, to successfully achieve power reduction without performance degradation. By observing system behavior via control variables, FQM applies pre-estimated policies to monitor and schedule I/O activities. We implement a prototype of FQM under Linux kernel and evaluate its effectiveness with different applications in terms of power consumption, QoS, and performance. Our experimental results show that FQM can effectively save energy while maintaining high QoS stability.
Le et al. (Tue,) studied this question.
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