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Overview A common way to save energy with computers is exploring the CPU frequency switch capability. The Raspberry Pi uses an ARM1176JZF-S processor and according to the ARM on-line documentation this CPU can be run in any frequency under the maximal one, supported by the processor. To be able to performance any frequency the ARM11 architecture emulate a continuous DVS(Dynamic Voltage Scaling), in a discrete processor. It is accomplished by holding the voltage at the maximum level and then switch the system clock between the maximum frequency and off. In order to apply this the Intelligent Energy Management (IEM) — it is a technology that runs on ARM processor to classify the types of activity and to analyze their processor utilization patterns for global prediction about the future performance required by the system defines frames that are directly related to the performance level. In Figure 1 the system performance requested in the first frame is 50%, so the CPU work at maximum frequency for half of the frame, and then it is turned off for the rest of the frame. In the second frame a performance of 25% of the CPU, and then 75% in the last frame.
