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PCC: Re-architecting Congestion Control for Consistent High Performance

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TCP and its variants have suffered from surprisingly poor performance for decades. We argue the TCP family has little hope to achieve consistent high performance due to a fundamental architectural deficiency: hardwiring packet-level events to control responses. We propose Performance-oriented Congestion Control (PCC), a new congestion control architecture. Under PCC , each sender continuously observes the connection between its actions and empirically experienced performance, enabling it to consistently adopt actions that result in high performance. Across many real-world and challenging environments, PCC shows consistent and often 10× performance improvement, with better fairness and stability than TCP . PCC requires no router hardware support or new packet format.

Joint work with Mo Dong, P. Brighten Godfrey, Qingxi Li, and Doron Zarchy

This talk is part of the Microsoft Research Cambridge, public talks series.

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