Tracking Elephant Flows in Internet Backbone Traffic with an FPGA-Based Cache

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Executive Summary

This paper presents an FPGA-friendly approach to tracking elephant flows in network traffic. The authors' approach, Single Step Segmented Least Recently Used (S3-LRU) policy, is a network traffic-friendly replacement policy for maintaining flow states in a Nayve Hash Table (NHT). They demonstrate that their S3-LRU approach preserves elephant flows: conservatively promoting potential elephants and evicting low-rate flows in LRU manner. Their approach keeps flow-state of any elephant since start-of-day and provides a significant improvement over filtering approaches proposed in previous work. Their FPGA-based implementation of the S3-LRU in combination with an NHT suites well the parallel access to block memories while capitalising on the retuning of parameters through dynamic-reprogramming.

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