Expanding across time to deliver bandwidth efficiency and low latency
summary
Opera is a reconfigurable datacenter network that steps through precomputed matchings on circuit switches so the instant topology is an expander while, over time, every rack pair gets a direct circuit. It relies on no active circuit scheduling and deterministic, staggered reconfiguration (typically 1–10 ms reconfiguration), so short flows use multi‑hop expander paths and long flows wait for direct paths (the paper identifies a 15–30 MB cutoff). Packet simulations and a P4 prototype show up to 4x bandwidth for all‑to‑all workloads and ~60% higher supported load versus cost‑equivalent static topologies.
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chapters (10)
- 0:00Introduction
- 0:35Challenges
- 1:49Expanders
- 6:19Inverse properties
- 7:06Highlevel design properties
- 10:33Matching properties
- 11:40Staggering switches
- 13:39Data center traffic
- 14:31Packet level simulations
- 17:00Practical considerations
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