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Aperiodic traffic in response time analyses with adjustable safety level

Dawood Khan 1 Nicolas Navet 1 Bernard Bavoux 2 Jörn Migge 3
1 TRIO - Real time and interoperability
INRIA Lorraine, LORIA - Laboratoire Lorrain de Recherche en Informatique et ses Applications
Abstract : In distributed real-time systems it is crucial to ensure the temporal validity of the data exchanged among the nodes. Classically, the frame Worst Case Response Time (WCRT) analyses, and the software tools which implement them, do not take into account the aperiodic traffic. One of the main reasons for this is that the aperiodic traffic is generally very difficult to characterize (i.e., the arrival patterns of the aperiodic frames). The consequence of this is that one tends to underestimate the WCRT, which may have an impact on the overall safety of the system. In this paper, we propose a probabilistic approach to model the aperiodic traffic and integrate it into response time analysis. The approach allows the system designer to choose the safety level of the analysis based on the system's dependability requirements. Compared to existing deterministic approaches the approach leads to more realistic WCRT evaluation and thus to a better dimensioning of the hardware platform.
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Submitted on : Monday, November 30, 2009 - 9:58:21 AM
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Dawood Khan, Nicolas Navet, Bernard Bavoux, Jörn Migge. Aperiodic traffic in response time analyses with adjustable safety level. 14th IEEE International Conference on Emerging Techonologies and Factory Automation - ETFA 2009, Sep 2009, Palma de Mallorca, Spain. ⟨inria-00437221⟩

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