An extendible approach for analyzing fixed priority hard real-time tasks
Real-Time Systems
Efficient fair queueing using deficit round robin
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Network calculus: a theory of deterministic queuing systems for the internet
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Worst-case traversal time modelling of Ethernet based in-car networks using real time calculus
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ECRTS '12 Proceedings of the 2012 24th Euromicro Conference on Real-Time Systems
Synthesis of communication schedules for TTEthernet-based mixed-criticality systems
Proceedings of the eighth IEEE/ACM/IFIP international conference on Hardware/software codesign and system synthesis
Monitoring Arbitrary Activation Patterns in Real-Time Systems
RTSS '12 Proceedings of the 2012 IEEE 33rd Real-Time Systems Symposium
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Ethernet networks become increasingly popular in many distributed embedded applications. As an alternative to strict priority (SP) scheduling, weighted round robin (WRR) is supported by most commercially available Ethernet switches. In WRR scheduling the link capacity is distributed fairly among traffic streams according to preset weights on a per round basis. As WRR does not provide latency guarantees, formal timing verification is necessary in order to deploy WRR in real-time applications. In this paper, we present a formal method to analyze WRR scheduling in Ethernet networks. Compared to existing methods which overestimate by assuming unnecessarily high interference, our method will take actual load bounds into account, thus achieving tighter analysis results. Finally, we perform an evaluation of our approach against existing methods and also against SP scheduling.