# Message scheduling to reduce AFDX jitter in a mixed NoC/AFDX architecture

Ermont, Jérôme and Mouysset, Sandrine and Scharbarg, Jean-Luc and Fraboul, Christian Message scheduling to reduce AFDX jitter in a mixed NoC/AFDX architecture. (2018) In: 26th International Conference on Real-Time Networks and Systems (RTNS’2018), 10 October 2018 - 12 October 2018 (Chasseneuil-du-Poitou, France).

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Official URL: https://doi.org/10.1145/3273905.3273929

## Abstract

Current avionics architecture are based on an avionics full duplex switched Ethernet network (AFDX) that interconnects end systems. Avionics functions exchange data through Virtual Links (VLs), which are static flows with bounded bandwidth. The jitter for each VL at AFDX entrance has to be less than 500 $\mu s$. This constraint is met, thanks to end system scheduling. The interconnection of many-cores by an AFDX backbone is envisioned for future avionics architecture. The principle is to distribute avionics functions on these many-cores. Many-cores are based on simple cores interconnected by a Network-on-Chip (NoC). The allocation of functions on the available cores as well as the transmission of flows on the NoC has to be performed in such a way that the jitter for each VL at AFDX entrance is still less than 500 us. A first solution has been proposed, where each function manages the transmission of its VLs. The idea of this solution is to distribute functions on each many-core in order to minimize contentions for VLs which concern functions allocated on different many-cores. In this paper, we consider that VL transmissions are managed by a single task in each many-core. We propose to construct a scheduling table executed by this task using an Integer Linear Program. The access to the Ethernet interface is then only allowed to one VL leading to a significant reduction of the jitter.

Item Type: Conference or Workshop Item (Paper) Thanks to the Association for Computing Machinery (ACM). This paper appears in RTNS '18 Proceedings of the 26th International Conference on Real-Time Networks and Systems. ISBN: 978-0-7918-5461-7. The original PDF is available at: https://dl.acm.org/citation.cfm?doid=3273905.3273929 hal-01925152 International conference proceedings French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)Université de Toulouse > Université Toulouse - Jean Jaurès - UT2J (FRANCE)Université de Toulouse > Université Toulouse 1 Capitole - UT1 (FRANCE) download 16 Nov 2018 13:51

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