Improving the performance of TCP over the ATM-UBR service

Authors:
Rohit Goyal;Raj Jain;Shiv Kalyanaraman;Sonia Fahmy;Bobby Vandalore
Affiliations:
Department of Computer and Information Science, 395 Dreese Lab, 2015 Neil Avenue, The Ohio State University, Columbus, OH 43210-1277, USA;Department of Computer and Information Science, 395 Dreese Lab, 2015 Neil Avenue, The Ohio State University, Columbus, OH 43210-1277, USA;Department of Computer and Information Science, 395 Dreese Lab, 2015 Neil Avenue, The Ohio State University, Columbus, OH 43210-1277, USA;Department of Computer and Information Science, 395 Dreese Lab, 2015 Neil Avenue, The Ohio State University, Columbus, OH 43210-1277, USA;Department of Computer and Information Science, 395 Dreese Lab, 2015 Neil Avenue, The Ohio State University, Columbus, OH 43210-1277, USA
Venue:
Computer Communications
Year:
1998

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Abstract

In this paper we study the design issues for improving TCP performance over the ATM UBR service. ATM-UBR switches respond to congestion by dropping cells when their buffers become full. TCP connections running over UBR can experience low throughput and high unfairness. Intelligent switch drop policies and end-system policies can improve the performance of TCP over UBR with limited buffers. We describe the various design options available to the network as well as to the end systems to improve TCP performance over UBR. We study the effects of early packet discard, and present a per-VC accounting-based buffer management policy. We analyze the performance of the buffer management policies with various TCP end system congestion control policies, including slow start and congestion avoidance, fast retransmit and recovery and selective acknowledgments. We present simulation results for various small and large latency configurations with varying buffer sizes and number of sources.