Journal article

Better Never than Late: Meeting Deadlines in Datacenter Networks

Wilson C, Ballani H, Karagiannis T, Rowstron A ...see all

Proc. ACM Conference on Communications Architectures, Protocols and Applications (SIGCOMM'11) (2011) pp. 50-61

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The soft real-time nature of large scale web applications in today's datacenters, combined with their distributed work- flow, leads to deadlines being associated with the datacenter application traffic. A network flow is useful, and contributes to application throughput and operator revenue if, and only if, it completes within its deadline. Today's transport pro- tocols (TCP included), given their Internet origins, are ag- nostic to such flow deadlines. Instead, they strive to share network resources fairly. We show that this can hurt appli- cation performance. Motivated by these observations, and other (previously known) deficiencies of TCP in the datacenter environment, this paper presents the design and implementation of D3, a deadline-aware control protocol that is customized for the datacenter environment. D3 uses explicit rate control to apportion bandwidth according to flow deadlines. Evalua- tion from a 19-node, two-tier datacenter testbed shows that D3, even without any deadline information, easily outper- forms TCP in terms of short flow latency and burst toler- ance. Further, by utilizing deadline information, D3 effec- tively doubles the peak load that the datacenter network can support.

Author-supplied keywords

  • datacenter
  • deadline
  • online services
  • sla

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  • Christo Wilson

  • Hitesh Ballani

  • Thomas Karagiannis

  • Ant Rowstron

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