Evaluating COPA congestion control for improved video performance

What this post added

This post details the evaluation and implementation of the COPA congestion control algorithm within Meta's QUIC transport stack for optimizing video performance on the Facebook Live Android platform. It describes COPA's tunable delay-based approach, contrasting it with CUBIC and BBR v1. The post presents A/B test results demonstrating COPA's superior performance in reducing application-observed RTT and improving goodput, especially in adverse network conditions, compared to CUBIC and BBR v1. It also analyzes transport RTT and retransmission overhead, identifying potential network policing as a factor affecting COPA's performance in tail cases. The contribution lies in the practical deployment and large-scale evaluation of a novel congestion control algorithm to enhance real-time video streaming quality and reduce latency.