The Experience and Motivation

别的不赘述，倒是对“下一代RDMA”的期望比较值得一说:

We advocate that the next generation of CC for RDMA or other types of high-speed networks should have the following properties simultaneously to make a significant improvement on both application performance and network stability:

(i) Fast converge. The network can quickly converge to high utilization or congestion avoidance. The timing of traffic adjustments should be adaptive to specific network environments rather than manually configured.

(ii) Close-to-empty queue. The queue sizes of in-network buffers are maintained steadily low, close-to-zero.

(iii) Few parameters. The new CC should not rely on lots of parameters that require the operators to tune. Instead, it should adapt to the environment and traffic pattern itself, so that it can reduce the operational complexity.

(iv) Fairness. The new CC ensures fairness among flows.

(v) Easy to deploy on hardware. The new CC algorithm is simple enough to be implemented on commodity NIC hardware and commodity switch hardware.