Evaluation of advanced TCP stacks on fast long-distance networks

With the growing needs of data intensive science, such as High Energy Physics, and the need to share data between multiple remote computer and data centers worldwide, the necessity for high network performance to replicate large volumes (TBytes) of data between remote sites in Europe, Japan and the U.S. is imperative. Currently, most production bulk-data replication on the network utilizes mul-tiple parallel standard (Reno based) TCP streams. Optimizing the window sizes and number of paral-lel stream is time consuming, complex, and varies (in some cases hour by hour) depending on net-work congurations and loads. We therefore evalu-ated new advanced TCP stacks that do not require multiple parallel streams while giving good perfor-mances on high speed long-distance network paths. In this paper, we report measurements made on real production networks with various TCP implemen-tations on paths with dierent Round Trip Times (RTT) using both optimal and sub-optimal window sizes. We compared the New Reno TCP with th