Performance improvement of multipath TCP over non-uniform paths using slow path adaptation.

摘要

This thesis describes a thorough evaluation of performance of recently developed Multipath Transport Protocol, namely MPTCP; deals with some performance issues in specific scenarios and proposes a potential solution. Multipath TCP (MPTCP) is an extension of TCP, developed by Internet Engineering Task Force (IETF) to support communication between source and destination through multiple flows under a single connection session. We have conducted several experiments with real hardware on flows with extreme variation in path quality and found that unless receive buffer size is increased to a much higher value, the overall throughput decreases below the level of single-path TCP throughput. We propose a Slow Path Adaptation (SPA) technique to overcome this issue without affecting other performance parameters. The implementation is done on Linux kernel and experimental results are presented.