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Explicit Congestion Avoidance:
Cooperative Mechanisms for Reducing
Latency and Proportionally Sharing
Bandwidth
March 1, 2001
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Download Document
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BibTex
Authors

Paul Barham
Publication Type
TechReport
Pages
15
Number
MSR-TR-2001-100

Abstract

Related Info
Abstract
This paper presents the design and evaluation of a cooperative congestion avoidance system
suitable for corporate Intranets or home networks. Explicit Congestion Avoidance (ECA) relies
on host operating systems to introduce appropriate per-flow virtual bottlenecks, with the
intention of keeping queuing out of the network. The network provides an indication of the
aggregate demand for resources on each path, and a cooperative distributed algorithm adjusts
these virtual bottlenecks in proportion to per-flow weights, so as to maintain network utilization
at a level where queuing is rare. In addition, network bandwidth is shared in proportion to the
weights of the competing flows and end-to-end latency is greatly reduced. Unmodified higher
level protocols merely see a reduced capacity channel and adapt to the available bandwidth. For
example, the packets which TCP would normally force into router queues to increase the RTT,
are instead voluntarily queued inside the operating system. Experiments show that time sensitive
media streams can be protected from contention, and that response times for short HTTP
requests can be improved by a factor of 5.
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