Showing papers by "Shivkumar Kalyanaraman published in 1997"
08 Jun 1997
TL;DR: The UBR+ service proposes enhancements to UBR for intelligent drop, which improves both throughput and fairness and the early packet discard scheme improves throughput but does not attempt to improve fairness.
Abstract: ATM-UBR service responds to congestion by dropping cells when switch buffers become full. TCP connections running over UBR experience low throughput and high unfairness. For 100% TCP throughput, each switch needs buffers equal to the sum of the window sizes of all the TCP connections. Intelligent drop policies can improve the performance of TCP over UBR with limited buffers. The UBR+ service proposes enhancements to UBR for intelligent drop. The early packet discard scheme improves throughput but does not attempt to improve fairness. The selective packet drop scheme based on per-connection buffer occupancy improves fairness. The fair buffer allocation scheme further improves both throughput and fairness.
72 citations
22 Sep 1997
TL;DR: In this article, the performance of selective acknowledgements (SACK) with TCP over the ATM-UBR service category is studied and various TCP congestion control mechanisms compare their performance for LANs and WANs.
Abstract: We study the performance of selective acknowledgements (SACK) with TCP over the ATM-UBR service category. We examine various unspecified bit rate (UBR) drop policies, TCP mechanisms and network configurations to recommend optimal parameters for TCP over UBR. We discuss various TCP congestion control mechanisms compare their performance for LANs and WANs. We describe the effect of satellite delays on TCP performance over UBR and present simulation results for LANs, WANs and satellite networks. SACK TCP improves the performance of TCP over UBR, especially for large delay networks. Intelligent drop policies at the switches are an important factor for good performance in local area networks.
22 citations
Journal Article•
21 citations
Proceedings Article•
01 Jan 1997
TL;DR: In this article, the performance of TCP over ABR in an ATM backbone is studied and the ERICA+ switch scheme is refined to handle the combined effect of highly varying demands and highly varying ABR capacity.
Abstract: We extend our earlier studies of buffer requirements of TCP over ABR in two directions. First, we study the performance of TCP over ABR in an ATM backbone. On the backbone, the TCP queues are at the edge router and not inside the ATM network. The router requires buffer equal to the sum of the receiver window sizes of the participating TCP connections. Second, we introduce various patterns of VBR background traffic. The VBR background introduces variance in the ABR capacity and the TCP traffic introduces variance in the ABR demand. Some simple switch schemes are unable to keep up with the combined effect of highly varying demands and highly varying ABR capacity. We present our experiences with refining the ERICA+ switch scheme to handle these conditions.
14 citations
01 Jan 1997
TL;DR: This research presents a probabilistic procedure to estimate the probability that a central nervous system disorder, known as a “spatially aggregated immune attack,” will occur during the natural course of a person’s development.
Abstract: Bobby Vandalore, Shivkumar Kalyanaraman, Raj Jain, Rohit Goyal, Sonia Fahmy The Ohio State University, Department of CIS Columbus, OH 43210-1277 Phone: 614-688-4482, Fax: 614-292-2911 Email: fvandalor, shivkuma, jain, goyal, fahmyg@cis.ohio-state.edu Seong-Cheol Kim Principal Engineer, Network Research Group, Communication Systems R&D Center Samsung Electronics Co. Ltd., Chung-Ang Newspaper Bldg. 8-2, Karak-Dong, Songpa-Ku, Seoul, Korea 138-160 Email: kimsc@metro.telecom.samsung.co.kr Abstract
2 citations