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A survey on quality of service in network-on-chip

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  1. Abstract
  2. Introduction
    1. Network topologies
    2. Routing
    3. Flow control
    4. Quality of service (QoS)
  3. QoS problems, limitations and management
  4. Existing QoS models
  5. Measuring QNOC performance
    1. Throughput
    2. Latency
    3. Fault tolerance
    4. NoC router cost analysis
    5. Noc simulation framework
  6. Conclusion
  7. References

This paper presents a survey on one of the key Network-on-Chip (NoC) research area i.e. Quality of Service (QoS): Service classification and negotiation. The models of QoS are classified into different categories based on synchronous, that is, having single clock domain or asynchronous NoC and the number of service levels, type of switching network, implementations and evaluated on the basis performance parameters, benchmarks and varying cost factors have been proposed. The most interesting and universally applicable performance metrics of NoC are latency, bandwidth, jitter, power consumption, and area usage. Latency, bandwidth and jitter can be classified as performance parameters, while power consumption and area usage are the cost factors. Keywords- QoS, latency, bandwidth, jitter, power consumption, area usage.

[...] As mentioned in this paper, a fair amount of work has been carried out in the field of Quality of Service in Network on Chip, still there is a lot of work needed to be carried out in this emerging field so as to increase the overall performance of NoC systems keeping in mind the key cost factors, that is, optimization for power and area. The future evolution of the QoS depends on the new technical approaches in the field of network on chip for better Quality of Service in congestion control and resource allocation and Quality of Service in routing. [...]


[...] As stated in Quality of Service is one of the crucial areas of research in NoC at the network level. D. Quality of Service (QoS) QoS refers to the capability of a network to provide better service to selected network traffic. There are primarily two types of traffic classes- Guaranteed throughput and Best Effort (BE). Communication services with guarantees on throughput and latency enables predictable system design. Although necessary for real time applications this results in poor resource utilization for applications that require variablebit-rate (VBR) communication. [...]


[...] Further it can be subdivided on the basis of providing QoS and Guaranteed services that is, more than one service level or not providing QoS implying no Guaranteed services, that is single service level or only BE services as shown in Fig 3. A two dimensional planar geometry with five ports routers and wormhole routing is most commonly used for NoC implementations. Although synchronous and asynchronous routers exhibit similar performance yet asynchronous NoC helps eliminate en-route resynchronizations and complex clock distribution. [...]

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