Impact of fairness on Internet performance

  • Authors:
  • Thomas Bonald;Laurent Massoulié

  • Affiliations:
  • France Telecom R&D;Microsoft Research

  • Venue:
  • Proceedings of the 2001 ACM SIGMETRICS international conference on Measurement and modeling of computer systems
  • Year:
  • 2001

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Abstract

We discuss the relevance of fairness as a design objective for congestion control mechanisms in the Internet. Specifically, we consider a backbone network shared by a dynamic number of short-lived flows, and study the impact of bandwidth sharing on network performance. In particular, we prove that for a broad class of fair bandwidth allocations, the total number of flows in progress remains finite if the load of every link is less than one. We also show that provided the bandwidth allocation is "sufficiently" fair, performance is optimal in the sense that the throughput of the flows is mainly determined by their access rate. Neither property is guaranteed with unfair bandwidth allocations, when priority is given to one class of flow with respect to another. This suggests current proposals for a differentiated services Internet may lead to suboptimal utilization of network resources.