Research On System Level Low Power Technology

Nowadays embedded system designers focus on not only the stability and real-time,but also the minimization of power consumption.With the improvement on system function and integration,system-level dynamic low power techniques are becoming more and moe popular. With the research of the project "New Concept and High Performance Computer Architecture" supported by China National Research and Development Program 863 Plan in the information technology, this paper focus on the research of dynamic power management. Based on the analysis of the disadvantages of traditional DPM techniques, a dynamic power management policy based on queue(Q-Based DPM) has been proposed.Q-Based DPM can not only minimize power consumpsion of system according to the workload,but also enhance the real-time ability of the system by pre-awake mechanism. The main work and contributions are outlined as follows:●The basic principles and models of DPM and DVS have been deeply researched.After anelysis of DPM principle, the relationship between the key factor of Q-Based DPM and its effect of the system power consumption is shown.●Traditional DPM policies' characters have been concluded.and their advantages and disadvantiges have been shown.●Due to the issue of traditional DPM policies often focus on a single PMC,this paper proposes Q-Based DPM which suitable for multi-PMC system. Q-Based DPM is based on the idea of cache of operating system. Q-Based DPM can dynamicly balance performance and power consumption of system according to the workload by the queue mechanism.●After the anelysis of the relationship between the key factor of Q-Based DPM and the effect on power consumption, the principle of how to decide the key factor is shown.The experiments show that Q-Based DPM has better effect on the balance of the performence and system power consumption.