Operating-system directed power reduction

  • Authors:
  • Yung-Hsiang Lu;Luca Benini;Giovanni De Micheli

  • Affiliations:
  • CSL, Stanford University;DEIS, Università di Bologna, Italy;CSL, Stanford University

  • Venue:
  • ISLPED '00 Proceedings of the 2000 international symposium on Low power electronics and design
  • Year:
  • 2000

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Abstract

this paper presents a new approach for power reduction by taking a global, software-centric view. It analyzes the sources of power consumption: tasks that require services from hardware components. When a component is not used by any task, it can enter a sleeping state to save power. Operating systems have detailed information about tasks; therefore, OS is the best place for identifying hardware idleness and shutting down unused components. We implement this technique in Linux and show that it can save more than 50% power compared to traditional hardware-centric shutdown techniques.