Dynamic voltage and frequency management based on variable update intervals for frequency setting

ABSTRACT

An efficient adaptive method to perform dynamic voltage and frequency management (DVFM) for minimizing the energy consumption of microprocessor chips is presented. Instead of using a fixed update interval, the proposed DVFM system makes use of adaptive update intervals for optimal frequency and voltage scheduling. The optimization enables the system to rapidly track the workload changes so as to meet soft real-time deadlines. The method, which is based on introducing the concept of an effective deadline, utilizes the correlation between consecutive values of the workload. In practice because the frequency and voltage update rates are dynamically set based on variable update interval lengths, voltage fluctuations on the power network are also minimized. The technique, which may be implemented by simple hardware and is completely transparent from the application, leads to power savings of up to 60% for highly correlated workloads compared to DVFM systems based on fixed update intervals.

REFERENCES

• 1: B. C. Mochocki, X. S. Hu, and G. Quan, "A Unified approach to variable voltage scheduling for nonideal DVS processors," IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems, vol. 23, no. 9, Sept. 2004, pp. 1370--1377.
• 2: Thomas D. Burd , Robert W. Brodersen, Design issues for dynamic voltage scaling, Proceedings of the 2000 international symposium on Low power electronics and design, p.9-14, July 25-27, 2000, Rapallo, Italy [doi>10.1145/344166.344181]
• 3: T. Burd, T. Pering, et al., "A Dynamic voltage scaled microprocessor system," IEEE Journal of Solid-State Circuits, vol. 35, no. 11, Feb. 2000, pp.294--295.
• 4: K. Nowka, G. D. Carpenter, et al., "A 0.9 V to 1.95 V dynamic voltage-scalable and frequency-scalable 32-bit PowerPC processor," in IEEE Int. Solid-State Circuits Conf. Feb. 2002, pp. 340--341.
• 5: K. J. Nowka, G. D. Carpenter, et al., "A 32-bit PowerPC system-on-a-chip with support for dynamic voltage scaling and dynamic frequency scaling," IEEE Journal of Solid-State Circuits, vol. 37, no. 11, Nov. 2002, pp. 1441--1447.
• 6: Krisztián Flautner , David Flynn , David Roberts , Dipesh I. Patel, IEM926: An Energy Efficient SoC with Dynamic Voltage Scaling, Proceedings of the conference on Design, automation and test in Europe, p.30324, February 16-20, 2004
• 7: M. Elgehaly, A. Fahim, et al., "Robust and efficient dynamic voltage scaling architecture," IEEE International System on Chip Conference, Sep 2003, pp. 155--158.
• 8: PACE: A New Approach to Dynamic Voltage Scaling, IEEE Transactions on Computers, v.53 n.7, p.856-869, July 2004 [doi>10.1109/TC.2004.35]
• 9: M. Nakai, S. Akui, et al., "Dynamic voltage and frequency management for a low-power embedded microprocessor," IEEE Journal of Solid-State Circuits, vol. 40, no. 1, Jan. 2005, pp 28--35.

INDEX TERMS

Primary Classification:
  C. Computer Systems Organization
  C.3 SPECIAL-PURPOSE AND APPLICATION-BASED SYSTEMS
      Subjects: Real-time and embedded systems

Additional Classification:
  C. Computer Systems Organization
  C.5 COMPUTER SYSTEM IMPLEMENTATION
      C.5.4 VLSI Systems

Keywords:
dynamic voltage scaling, power management, update intervals