PowerTCP: Pushing the Performance Limits of Datacenter Networks

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" summary

Introduces PowerTCP, a congestion control that drives send-window updates from the bandwidth–window product (called power) and measures it via in-band network telemetry (with an RTT-only approximation). Implements multiplicative increase/decrease plus EWMA and evaluates on RDMA oversubscribed fabrics and reconfigurable datacenters. Claims one-RTT convergence, cuts short-flow tail FCTs by ~80% vs DCQCN/TIMELY and ~33% vs HPCC, reaches ~85% circuit utilization in reconfigurable setups while keeping queues short.

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" chapters (15)

1. 0:00Intro
2. 0:32Brief context of electrical systems
3. 0:51Analogy to networked systems
4. 1:20PowerTCP in a Nutshell
5. 3:00Fear of the buffer Buffer per unit capacity (KB/Gbps)
6. 4:25Timeline of congestion control in datacenters
7. 5:43Problems of existing approaches
8. 7:11Summary of Our Analysis Voltage-based
9. 8:04The notion of power
10. 9:32PowerTCP control law
11. 10:49Evaluation - Incast
12. 12:02Evaluation - Fairness & Stability
13. 13:10Evaluation - Workload PowerTCP
14. 14:17Evaluation - Reconfigurable Networks
15. 15:41Conclusion

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