Rock around the Clock (Synchronization): Improve Performance...
summary
Demo shows a Kubernetes e‑commerce site whose tail latency jumps from ~140 ms to ~5 s when a data “elephant” workload shares the link, with system delays rising to ~1.8 ms and ~28,000 packets/sec dropped. Explains why NTP’s round‑trip assumption fails for one‑way delay visibility, compares PTP capable switches and software Hens probes that classify pure samples, and cites congestion control that pauses senders by microseconds to avoid retransmits and reduce tail latency.
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chapters (9)
- 0:00Introduction
- 0:17Clock sync in apps matters
- 1:00Network contention demo
- 4:55Quartz and atomic clocks
- 5:58NTP and bank heist
- 8:49Precision Time Protocol
- 9:51Huygens high-precision sync
- 12:20Congestion control with sync
- 15:15Summary
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