~/talk

Barre: Empowering Simplified and Versatile Programmable Congestion Control in...

on YouTube 17m
Talkat USENIX ATC '25 · 2025-07-07..07-09· [networking, machine-learning]

speakers

name:Yajuan Peng
links:none on file
name:Haoran Wei
links:none on file
name:Xiaolong Zhong
links:none on file
name:Junkai Huang
links:none on file
name:Haohan Xu
links:none on file
name:Zicheng Wang
links:none on file
name:Yang Bai
links:none on file
name:Zhuo Jiang
links:none on file
name:Jianxi Ye
links:none on file
name:Xiaoliang Wang
links:none on file
name:Xiaoming Fu
links:none on file
name:Huichen Dai
links:none on file

resources

video:https://youtu.be/wVmHk9U3i3c
slides:none on file

summary

Barre is a practical PCC-style congestion controller that runs on BlueField-3 SmartNICs, uses RTD probe packets plus high-frequency CMP signals, and implements adaptive AMD increases, a dual-lock limiter, and an inflight monitor to bound packet bloat. Deployed on a 400 Gbps RoCE cluster for over a year supporting 10,000 GPUs, Barre improves AI training throughput by about 9.6%, reduces queue length up to 19%, handles RT probe loss up to 8.9%, and adapts DCQCN parameters for a 19% normalized throughput gain.

AI-written summary · about

chapters (9)

  1. 0:00Barre introduction
  2. 1:25Modern congestion control challenges
  3. 3:13Practical design principles
  4. 6:26Barre’s algorithm
  5. 11:12Barre on BlueField-3
  6. 13:06Evaluation vs DCQCN & InfiniBand
  7. 14:33Production results
  8. 15:16Optimizing DCQCN with Barre
  9. 16:20Conclusion

related talks

~/search
type to search 6,249 conferences, 138,987 speakers and 185,172 talks
~/help
cmdctrl k
search every conference, speaker and series
/
focus the filter search
h
home
c
conferences
s
speakers
e
series
t
light / dark — the status bar button does the same
?
this help
esc
close this, then clear every filter — or just the search, while you are typing in it

Ignored while you are typing. Pages without a filter rail have no search to focus.