REAL: Emulating Control Plane at Simulator’s Cost
summary
REAL implements transparent syscall interposition via LD_PRELOAD, replaces TCP over veth with message-level IPC delivery, enforces run-to-idle scheduling and uses iterative converge with snapshot/restore to cut emulation overhead. Evaluation finds a new EverRouting data-race bug, runs up to 47× faster than unmodified emulation, matches or beats Batfish on some topologies, and reduces memory so it scales from 1,000-node setups to thousands (authors report up to 4,500 nodes on four commodity servers).
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chapters (11)
- 0:00Introduction
- 1:40Simulation vs emulation limits
- 2:43Emulation overhead sources
- 5:53Root cause of inefficiency
- 7:20Ideal runtime design
- 8:22Run-to-idle scheduling
- 9:24Iterative convergence
- 10:27LD_PRELOAD interposition
- 12:11Evaluation results
- 13:58Conclusion
- 14:20Q&A
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