Flow Balancing Hardware for Parallel TCP Streams on Long Fat Pipe Network

Parallel TCP streams are used for data transfer between clusters in today's high performance applications. When parallel TCP streams are used on LFN, part of streams fail to get enough bandwidth because of congestion generated by the parallel TCP stream themselves. As a result, data transfer throughput is bottlenecked by the slow streams. In this paper, the authors propose the Stream Harmonizer that schedules packet transmission of parallel TCP streams to balance the bandwidth. The purpose of the Stream Harmonizer is to reduce the congestion that is generated by the parallel TCP streams themselves to improve the performance of the slow streams. The Stream Harmonizer reduces congestion by reducing the bandwidth of fast streams by increasing the Round Trip Time (RTT) of them.