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An analysis of the impact of bus contention on the WCET in multicores
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The use of multicores is becoming widespread inthe field of embedded systems, many of which have real-time
requirements. Hence, ensuring that real-time applications meet their timing constraints is a pre-requisite before
deploying them on these systems. This necessitates the consideration of the impact of the contention due to shared lowlevel
hardware resources like the front-side bus (FSB) on the Worst-CaseExecution Time (WCET) of the tasks.
Towards this aim, this paper proposes a method to determine an upper bound on the number of bus requests that tasks
executing on a core can generate in a given time interval. We show that our method yields tighter upper bounds in
comparison with the state of-the-art. We then apply our method to compute the extra contention delay incurred by tasks,
when they are co-scheduled on different cores and access the shared main memory, using a shared bus, access to which
is granted using a round-robin arbitration (RR) protocol.
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IEEE