An implementation and experimental study of the Adaptive PI Rate Control Protocol

Adaptive PI rate control protocol (API-RCP) has been proposed as an explicit congestion control mechanism. In this paper, a Linux-based testbed is created to validate the features and performance of API-RCP. Various issues on implementing API-RCP in Linux kernel are addressed. There are two outcomes of our experimental results: a) Confirm that in practice API-RCP is as effective as the theory asserts in achieving a high and smooth sending rate, a small and smooth round trip time (RTT), an almost full link utilization and zero packet drop, and b) Demonstrate that API-RCP exhibits good robustness to varying network environment with changing flows or network delays. All these support that API-RCP is a very viable candidate in the real network implementations.