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Evaluation and Suggested Improvements for the SCI Flow Control

Gunnar Ronneberg, Olav Lynse, and Geir Horn
University of Oslo, Dep. of Computer Science

SCI-Europe '99, Toulouse, Session 8 - SCI Insights , September 1999

Abstract:

The main purpose of this paper is to present the result of the analysis of the SCI standard flow control protocol. We emphasize that the standard flow control does not manage to portion the bandwidth equally between the nodes for all traffic scenarios, specially not for one called the Switch case. Based on the result from the analysis we state that the reason is the way the save_go variable is used. We also introduce a new flow control mechanism, called the dynamic rate flow control. Finally, this protocol is implemented and tested for a variety of traffic patterns where some performance improvements were achieved versus the standard flow control protocol.

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