Pudica: Toward Near-Zero Queuing Delay in Congestion Control for Cloud Gaming
Talkat 21st USENIX Symposium on Networked Systems Design and Implementation (NSDI '24) · 2024-04-16..04-18·
summary
Pudica is an end-to-end congestion control that probes link BUR (bandwidth utilization ratio) by sending paced frame traffic plus occasional payload-free probe packets, uses a pace multiplier to slightly overshoot available bandwidth, and adjusts per-frame bitrate with a windowed BR estimator plus short-term corrections and a Q-draining phase (alpha ≈ 0.85). AB tests on Tencent’s cloud gaming platform show near-zero queuing delay: average and tail frame delay drop 3.1× and 4.9×, stall rate falls 10.3×, bitrate rises 12.1%, and Pudica is deployed at million-user scale.
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chapters (8)
- 0:00Cloud gaming challenges
- 2:36User engagement metrics
- 4:48Existing congestion limits
- 7:40Pudica design goals
- 9:28Bandwidth probing with frames
- 13:51Pudica control framework
- 16:51Pudica performance results
- 18:23Summary and future
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