Firm Real-Time System Scheduling Based on a Novel QoS Constraint

  • Authors:
  • Donglin Liu;Xiaobo Sharon Hu;Michael D. Lemmon;Qiang Ling

  • Affiliations:
  • -;-;-;-

  • Venue:
  • RTSS '03 Proceedings of the 24th IEEE International Real-Time Systems Symposium
  • Year:
  • 2003

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Abstract

Many real-time systems have firm real-time requirementswhich allow occasional deadline violations but discard anytasks that are not finished by their deadlines. To measurethe goodness of such a system, a quality of service (QoS)metric is needed. Examples of often used QoS metrics forfirm real-time systems are average deadline miss rates and(m, k)-firm constraint. However, for certain applications,these metrics may not be adequate measures of system performance.This paper introduces a novel QoS constraint fornetworked feedback control systems. We show that this constraintcan be directly related to the control system's performance.We then present three different scheduling approacheswith respect to this QoS constraint. Experimentalresults are provided to compare these approaches.