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OSDI '02 Paper    [OSDI '02 Tech Program Index]

Pp. 329-344 of the Proceedings

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TCP Nice: A Mechanism for Background Transfers

Arun Venkataramani Ravi Kokku Mike Dahlin 1

Laboratory of Advanced Systems Research
Department of Computer Sciences
University of Texas at Austin, Austin, TX 78712
{arun, rkoku, dahlin}


Many distributed applications can make use of large background transfers $-$ transfers of data that humans are not waiting for $-$ to improve availability, reliability, latency or consistency. However, given the rapid fluctuations of available network bandwidth and changing resource costs due to technology trends, hand tuning the aggressiveness of background transfers risks (1) complicating applications, (2) being too aggressive and interfering with other applications, and (3) being too timid and not gaining the benefits of background transfers. Our goal is for the operating system to manage network resources in order to provide a simple abstraction of near zero-cost background transfers. Our system, TCP Nice, can provably bound the interference inflicted by background flows on foreground flows in a restricted network model. And our microbenchmarks and case study applications suggest that in practice it interferes little with foreground flows, reaps a large fraction of spare network bandwidth, and simplifies application construction and deployment. For example, in our prefetching case study application, aggressive prefetching improves demand performance by a factor of three when Nice manages resources; but the same prefetching hurts demand performance by a factor of six under standard network congestion control.

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Next: Introduction
Arun Venkataramani 2002-10-08

This paper was originally published in the Proceedings of the 5th Symposium on Operating Systems Design and Implementation, December 9–11, Boston, MA, US
Last changed: 6 Nov. 2002 aw
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