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Seo, Euiseong
School of Electrical and Computer Engineering
Research Interests
  • System software for flash memory
  • Embedded systems
  • Virtualization
  • Energy-efficient computing

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TSB: A DVS algorithm with quick response for general purpose operating systems

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Title
TSB: A DVS algorithm with quick response for general purpose operating systems
Author
Seo, EuiseongPark, SeonyeongKim, JinsooLee, Joonwon
Keywords
DVS algorithm; Dynamic voltage scaling; General purpose operating system; Low-power techniques
Issue Date
2008-01
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF SYSTEMS ARCHITECTURE, v.54, no.1-2, pp.1 - 14
Abstract
DVS is becoming an essential feature of state-of-the-art mobile processors. Interval-based DVS algorithms are widely employed in general purpose operating systems thanks to their simplicity and transparency. Such algorithms have a few problems, however, such as delayed response, prediction inaccuracies, and underestimation of the performance demand. In this paper we propose TSB (time slice based), a new DVS algorithm that takes advantage of the high transition speeds available in state-of-the-art processors. TSB adjusts processor performance at every context switch in order to match the performance demand of the next scheduled task. The performance demand of a task is predicted by analyzing its usage pattern in the previous time slice. TSB was evaluated and compared to other interval-based power management algorithms on the Linux kernel. The results show that TSB achieved similar or better energy efficiency compared to existing interval-based algorithms. In addition, TSB dramatically reduced the side effect of prolonging short-term execution times. For a task requiring 50 ms to run without a DVS algorithm, TSB prolonged the execution time by only 6% compared to results of 136% for CPUSpeed and 20% for Ondemand.
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DOI
10.1016/j.sysarc.2007.03.006
ISSN
1383-7621
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EE_Journal Papers
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