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On the effectiveness of the PIT in reducing upstream demand in an NDN router

Ahmadi, M ; Sharif University of Technology | 2020

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  1. Type of Document: Article
  2. DOI: 10.1016/j.peva.2020.102081
  3. Publisher: Elsevier B.V , 2020
  4. Abstract:
  5. The paper revisits the performance evaluation of caching in a Named Data Networking (NDN) router where the content store (CS) is supplemented by a pending interest table (PIT). The PIT aggregates requests for a given content that arrive within the download delay and thus brings an additional reduction in upstream bandwidth usage beyond that due to CS hits. We extend prior work on caching with non-zero download delay (non-ZDD) by proposing a novel mathematical framework that is more easily applicable to general traffic models and by considering alternative cache insertion policies. Specifically we evaluate the use of an LRU filter to improve CS hit rate performance in this non-ZDD context. We also consider the impact of time locality in demand due to finite content lifetimes. The models are used to quantify the impact of the PIT on upstream bandwidth reduction, demonstrating notably that this is significant only for relatively small content catalogues or high average request rate per content. We further explore how the effectiveness of the filter with finite content lifetimes depends on catalogue size and traffic intensity. © 2020 Elsevier B.V
  6. Keywords:
  7. Content popularity ; Named data networking ; Request aggregation ; Computer network performance evaluation ; Bandwidth reductions ; Cache insertion policies ; Caching ; Content popularities ; Mathematical frameworks ; Named data networkings ; Request aggregations ; Traffic intensity ; Bandwidth
  8. Source: Performance Evaluation ; Volume 138 , 2020
  9. URL: https://www.sciencedirect.com/science/article/abs/pii/S0166531620300018