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DAS: An Efficient NoC Router for Mixed-Criticality Real-Time Systems

Mourad Dridi 1 Stéphane Rubini 1 Mounir Lallali 2 Martha Johanna Sepulveda Florez Frank Singhoff 1 Jean-Philippe Diguet 3
1 Lab-STICC_UBO_CACS_MOCS
UBO - Université de Brest, Lab-STICC - Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance
2 Lab-STICC_UBO_CACS_MOCS
IBNM - Institut Brestois du Numérique et des Mathématiques, Lab-STICC - Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance
3 Lab-STICC_UBS_CACS_MOCS
Lab-STICC - Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance
Abstract : Mixed-Criticality Systems (MCS) are real-time systems characterized by two or more distinct levels of criticality. In MCS, it is imperative that high-critical flows meet their deadlines while low-critical flows can tolerate some delays. Sharing resources between flows in Network-On-Chip (NoC) can lead to different unpredictable latencies and subsequently complicate the implementation of MCS in many-core architectures. This paper proposes a new virtual channel router designed for MCS deployed over NoCs. The first objective of this router is to reduce the worst-case communication latency of high-critical flows. The second aim is to improve the network use rate and reduce the communication latency for low-critical flows. The proposed router, called DAS (Double Arbiter and Switching router), jointly uses Wormhole and Store And Forward techniques for low and high-critical flows respectively. Simulations with a cycle-accurate SystemC NoC simulator show that, with a 15% network use rate, the communication delay of high-critical flows is reduced by 80% while communication delay of low-critical flow is increased by 18% compared to usual solutions based on routers with multiple virtual channels.
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https://hal.univ-brest.fr/hal-01713312
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Submitted on : Thursday, March 26, 2020 - 11:40:55 AM
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Mourad Dridi, Stéphane Rubini, Mounir Lallali, Martha Johanna Sepulveda Florez, Frank Singhoff, et al.. DAS: An Efficient NoC Router for Mixed-Criticality Real-Time Systems. 2017 IEEE 35th International Conference on Computer Design (ICCD), Nov 2017, Boston, United States. ⟨10.1109/ICCD.2017.42⟩. ⟨hal-01713312⟩

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