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Bolt: Sub-RTT Congestion Control for Ultra-Low Latency

on YouTube 16m
Talkat NSDI 2023 · 2023-04-17..04-19· [networking]

speakers

name:Serhat Arslan
links:none on file
name:Yuliang Li
links:none on file
name:Gautam Kumar
links:none on file
name:Nandita Dukkipati
links:none on file

resources

video:https://youtu.be/lEHO19XAQe8
slides:none on file

summary

Bolt pushes congestion control to sub-RTT reaction by using programmable switches to emit immediate per‑packet feedback and by combining Sub-RTT Control (SRC) with Proactive Ramp-Up (PRU) and Supply matching (SM). Implemented on SNAP in a Google testbed and evaluated up to 400 Gbps, it cuts 99th‑percentile latency by ~80% and improves 99th‑percentile flow completion times up to 3× versus Swift and HPCC while SRC packet overhead stays below 0.35% of bottleneck capacity.

AI-written summary · about

chapters (6)

  1. 0:00Introduction and motivation
  2. 2:46Defining the optimal approach
  3. 4:29Mechanism for sub-RTT control
  4. 7:22Addressing underutilization
  5. 9:36Experimental results
  6. 12:22Performance and conclusions

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