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X-Lap: A systems approach for cross-layer profiling and latency analysis for cyber-physical networks

Publication by Stefan Reif, Andreas Schmidt, Timo Hönig, Thorsten Herfet, Wolfgang Schröder-Preikschat
Related to the Energy-, Latency- And Resilience-aware Networking (e.LARN) project
Published in ACM SIGBED Review, 2018


Networked control applications for cyber-physical networks demand predictable and reliable real-time communication. Applications of this domain have to cooperate with network protocols, the operating system, and the hardware to improve safety properties and increase resource efficiency. In consequence, a cross-layer approach is necessary for the design and holistic optimisation of cyber-physical systems and networks. This paper presents X-Lap, a cross-layer, inter-host timing analysis tool tailored to the needs of real-time communication. We use X-Lapto evaluate the timing behaviour of a reliable real-time communication protocol. Our analysis identifies parts of the protocol which are responsible for unwanted jitter. To system designers, X-Lapprovides useful support for the design and evaluation of networked real-time systems.