Active queue management (AQM) has been proposed by networking
researchers and the Internet Engineering Task Force as a measure to
preserve and improve Internet performance but has not been
thoroughly evaluated under realistic conditions. This book
investigates the effects of several AQM algorithms on the
performance of TCP applications under realistic conditions. Our
primary results are that many existing AQM algorithms do not
perform as well as expected when they are used with packet
dropping. However, when combined with packet marking, AQM
algorithms significantly improve network and application
performance over conventional drop-tail queues. Moreover, AQM
enables network operators to run their networks near saturation
levels with only modest increases in average response times. If
packet marking is unavailable, the book presents a new form of
differential treatment of flows that can be used with packet
dropping and achieves a similar positive performance improvement.
The book also develops a new AQM algorithm that can balance between
loss rate and queuing delay to improve the overall system
performance.
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