Deconstructing bus access control policies for real-time multicores
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Document typeConference report
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Rights accessRestricted access - publisher's policy
All rights reserved. This work is protected by the corresponding intellectual and industrial property rights. Without prejudice to any existing legal exemptions, reproduction, distribution, public communication or transformation of this work are prohibited without permission of the copyright holder
ProjectPARMERASA - Multi-Core Execution of Parallelised Hard Real-Time Applications Supporting Analysability (EC-FP7-287519)
Multicores may satisfy the growing performance requirements of critical Real-Time systems which has made industry to consider them for future real-time systems. In a multicore, the bus contention-control policy plays a key role in system's performance and the tightness of the Worst-Case Execution Time (WCET) estimates. In this paper we develop analytical models of the contention that requests from different tasks running in different cores suffer for the two most-used contention control policies: Time-Division Multiple Access (TDMA) and Interference-Aware Bus Arbiter (IABA), which allows us to compare them. We further show the benefits of having such models for real-time system designers and chip providers. Our results show that WCET estimates obtained with TDMA are slightly (2%) tighter than those obtained with IABA, at the cost of knowing the exact cycle at which every access of every task accesses the bus. However, average performance is 10% worse with TDMA than with IABA. Overall, IABA is the most appealing contention-control policy since it allows achieving tight WCET estimates and high average performance with little burden for the user.
CitationJalle, J. [et al.]. Deconstructing bus access control policies for real-time multicores. A: IEEE International Symposium on Industrial Embedded Systems. "Proceedings of the 8th IEEE International Symposium on Industrial Embedded Systems: SIES 2013: Porto, Portugal, June 19-21, 2013". Porto: Institute of Electrical and Electronics Engineers (IEEE), 2013, p. 31-38.