Adapting TCP for Reconfigurable Datacenter Networks
summary
Modern reconfigurable datacenter networks reconfigure in as little as 20 μs and hold circuits for fewer than 10 RTTs, and standard TCP variants only reach about 50–55% circuit utilization. The authors build the open-source Etalon emulator and show two practical fixes: an in-network dynamic TOR buffer resizing that prebuffers ~40–50 packets, and an endpoint mechanism that uses the explicit ECN-echo cwnd boost to multiplicatively ramp up. Combined, these increase circuit utilization by 1.91× while increasing tail latency only 1.20×.
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chapters (7)
- 0:00The reconfigurable network
- 2:17The TCP performance gap
- 3:54Analyzing TCP limitations
- 6:42Dynamic buffer resizing
- 10:16Optimizing buffer trade-offs
- 15:26Re-TCP approach
- 19:15Conclusion and Q&A
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