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DVS (Dynamic Voltage Scaling) is a power-saving technique to calculate and adjust the voltage and frequency at run time, according to the workload requirement of OS. Recently, this technique has widely applied in many kinds of power-saving design, especially in real time system field. In the past time, the primary research of this issue is building an ideal model, ignoring all the conditional parameters of adjusting the voltage and frequency. But this ideal model is impossible to realize in the real world, due to the physical limitations and reactions. If not considering these transform factors in real time systems, it would have two influences: 1. The latency causes the real time damage. 2. The Energy overhead. In this paper, we will discuss these required elements of power transition. In additional, we also propose an algorithm that can reduce the power transition overhead up to 30% of the original one at most, and it will not damage the real time property.
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