Effect of flow aggregation on the maximum end-to-end delay

  • Authors:
  • Jinoo Joung;Byeong-Seog Choe;Hongkyu Jeong;Hyunsurk Ryu

  • Affiliations:
  • Sangmyung University, Seoul, Korea;Dongkuk University, Seoul, Korea;Samsung Advanced Institute of Technology, Kiheung, Korea;Samsung Advanced Institute of Technology, Kiheung, Korea

  • Venue:
  • HPCC'06 Proceedings of the Second international conference on High Performance Computing and Communications
  • Year:
  • 2006

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Abstract

We investigate the effect of flow aggregation on the end-to-end delay in large scale networks. We show that networks with Differentiated services (DiffServ) architectures, where packets are treated according to the class they belong, can guarantee the end-to-end delay for packets of the highest priority class, which are queued and scheduled with a strict priority, but without preemption. We then analyze the network with arbitrary flow aggregation and deaggregation, and again derive an upper bound on the end-to-end delay. Throughout the paper we use Latency-Rate (${\mathcal{LR}}$) server model, and prove that FIFO, Strict Priority, and other rate-guaranteeing servers with aggregated flows are all ${\mathcal{LR}}$ servers to individual flows in certain conditions. We show that the delay bound of a flow that experiences aggregation and deaggregation, including the flows in DiffServ, depends on, among others, the burst sizes of the other flows within the aggregated flow and the number of the aggregations and the deaggregations.