Hybrid Network of Packet Switching and STDM in a Multi-FPGA System

Shimizu, Tomoki; Ito, Kohei; Iizuka, Kensuke; Hironaka, Kazuei; Amano, Hideharu

doi:10.1109/coolchips52128.2021.9410322

Cited by 2 publications

(3 citation statements)

References 17 publications

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Section: Dynamic Switch Mechanismmentioning

confidence: 99%

“…A dynamic communication switching algorithm proposed here is an improved version in our earlier paper [3]. In [3], congestion is detected in each application region by comparing the measured execution time of each communication task and the deadlines manually decided. In a previous research in NoC, the work in [22] proposed the similar algorithm which monitors the communication performance in each PEs.…”

Section: Dynamic Switch Mechanismmentioning

confidence: 99%

“…We propose a hybrid router of STDM and packet switching which allows the packet switching to use the empty slots of the STDM in [3]. Packet switching exhibits best-effort performance and the STDM has a guaranteed throughput; therefore, the combination of the two methods is an effective means of constructing an efficient network between FPGAs.…”

Section: Introductionmentioning

confidence: 99%

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The Implementation of a Hybrid Router and Dynamic Switching Algorithm on a Multi-FPGA System

Shimizu

Ito

Iizuka

et al. 2022

IEICE Trans. Inf. & Syst.

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The multi-FPGA system known as, the Flow-in-Cloud (FiC) system, is composed of mid-range FPGAs that are directly interconnected by high-speed serial links. FiC is currently being developed as a server for multi-access edge computing (MEC), which is one of the core technologies of 5G. Because the applications of MEC are sometimes timing-critical, a static time division multiplexing (STDM) network has been used on FiC. However, the STDM network exhibits the disadvantage of decreasing link utilization, especially under light traffic. To solve this problem, we propose a hybrid router that combines packet switching for low-priority communication and STDM for high-priority communication. In our hybrid network, the packet switching uses slots that are unused by the STDM; therefore, best-effort communication by packet switching and QoS guarantee communication by the STDM can be used simultaneously. Furthermore, to improve each link utilization under a low network traffic load, we propose a dynamic communication switching algorithm. In our algorithm, each router monitors the network load metrics, and according to the metrics, timing-critical tasks select the STDM according to the metrics only when congestion occurs. This can achieve both QoS guarantee and efficient utilization of each link with a small resource overhead. In our evaluation, the dynamic algorithm was up to 24.6% faster on the execution time with a high network load compared to the packet switching on a real multi-FPGA system with 24 boards.

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Section: Dynamic Switch Mechanismmentioning

confidence: 99%