Characterization and Evaluation of End-System Performance Aware Transport Schemes for Fast Long-Distance Optical Networks

摘要

Fast long-distance optical networks are emerging for the purpose of transmitting large amounts of scientific data among research institutions quickly and reliably, standard TCP (Reno TCP) does not perform well because it fails to saturate link throughput in such high-bandwidth environment. Moreover, some novel study indicated that the network speed had outstripped the processing capacity of end nodes, thus several new protocols which are based on end-system performance monitoring has been proposed to take advantage of such networks. It is critical to provide a just and complete evaluation of these protocols. In this study, we compare two promising end-system performance aware rate adjustment schemes. First, a modified rate-based version of RBUDP which adjusts rate based on end-node packet loss ratio (Tsunami). Second, an end-system based scheme which takes buffer and CPU management into consideration (PA-UDP). Our experiments use a range of performance metrics, including throughput, intra-protocol fairness, TCP friendliness and rate adaptation speed to flow dynamics. The results provide insights into the effectiveness of these schemes and also for improvements in design and implementation of end-system performance aware protocols.