Experimental evaluation of an adaptive PI rate controller for congestion control

In order to eliminate oscillation arisen from AIMD window control strategy in TCP, an adaptive PI rate controller (PI-RCA) was proposed to smooth the traffic and to prevent network from congestion. Theoretical analysis and simulation evaluation showed that PI-RCA can make flow control system achieve stability robustness and adapt to sudden changes in network environment, thus providing the network with good transient behaviors. In this paper, we present an implemental evaluation of PI-RCA. We first implemented PI-RCA in the Linux kernel and solved various system issues. Second, we conducted some experiments to validate the previous simulation results. Compared with TCP, the experimental results show that the PI-RCA is much more easily to maximize link/per-flow utilization, to achieve fairness and nearly zero packet drops rate.