Congestion Control for Scalability in Bufferless On-Chip Networks

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Provided by: Carnegie Mellon University
Topic: Hardware
Format: PDF
In this paper, the authors present Network-on-Chip (NoC) design and contrast it to traditional network design, highlighting both similarities and differences between NoCs and traditional networks. As an initial case study, they examine network congestion in bufferless NoCs. They show that congestion manifests itself differently in a NoC than in a traditional network. This both reduces system throughput in congested workloads for smaller NoC sizes (16 and 64 nodes), and limits the scalability of the bufferless NoC in larger configurations (256 to 4096 nodes) even when data is mapped with locality in mind. They propose a source throttling-based congestion control mechanism with application-level awareness.
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