School of Computer Science and Technology,Soochow University, Suzhou, China

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Abstract—Traditional power management enables CPU to switch among different power consumption modes such as running, idle and standby to save energy to a certain degree. In battery-powered embedded Linux systems, power management plays an even more important role than in desktops. This paper proposes a practical solution to dynamic power management (DPM) based on dynamic frequency scaling (DFS). According to the system workload, it switches the working frequency among several predefined settings. This paper presents a design and implementation of the solution in an embedded Linux system. Experimental results on an Intel PXA250-based system have demonstrated that the system running a DPM-enabled Linux can save up to 44% of execution time with less than 8% extra power consumption in an email application.

Index Terms—Dynamic Frequency Scaling, Dynamic Voltage Scaling, Embedded Linux

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Cite: Zhang YuHua, Qian LongHua,Lv Qiang, Qian Peide,Guo Shengchao, "A Practical Dynamic Frequency Scaling Solution to DPM in Embedded Linux Systems," Journal of Computers vol. 4, no. 8, pp. 787-793, 2009.