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Mirror Mirror on the Ceiling: Flexible Wireless Links for Data Centers

Mirror Mirror on the Ceiling: Flexible Wireless Links for Data Centers. Presenter: Lu Gong. About Authors. About Authors: Xia Zhou. PhD candidate, UCSB Fields: Networks & Communications, Mathematics, Microbiology. About Authors: Zengbin Zhang. PhD candidate, UCSB

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Mirror Mirror on the Ceiling: Flexible Wireless Links for Data Centers

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  1. Mirror Mirror on the Ceiling:Flexible Wireless Links for Data Centers Presenter: Lu Gong

  2. About Authors

  3. About Authors: Xia Zhou • PhD candidate, UCSB • Fields:Networks & Communications, Mathematics, Microbiology

  4. About Authors: Zengbin Zhang • PhD candidate, UCSB • Fields: Wireless Systems and Networking, Mobile Computing and Distributed Systems

  5. About Authors: Yibo Zhu • PhD candidate, UCSB • Fields: Data Center Networks, Mobile Networks and Online Social Networks

  6. Problems with any wired network topology • Any large-scale network consists of multiple stages→nr of fibers/wires are doubled/tripled • Distribute fixed amount of fibers to every rack→ fibers are over deployed for the worst case • Once deployed, very hard to modify

  7. Our goal • Focus on a subset of applications • that do not require non-blocking all-to-all communication • exclude high-end datacenter computing • We hope to create a new primitive • high-throughput, beamforming wireless links in the 60GHz band

  8. Existing works • Signal leakage→ limits the concurrent active links • Line-of-sight requirement→ limits the effective range of links

  9. Properties of 60GHz band wireless links • 7GHz spectrum→ multi-Gbps bandwidth • High frequency → small interference • Able to use beamforming to enhance link rate and further suppress interference • 5mm wavelength → any object larger than 2.5mm can block/reflect signal

  10. Beamforming • A physical layer technique to concentrate transmission energy in a specific direction

  11. Testbed of link blockage

  12. Testbed of radio interference

  13. 3D Beamforming • Components: • Beamforming Radios • Ceiling Reflectors • Electromagnetic Absorbers • Prevent local reflections and scattering

  14. Testbed of 3D Beamforming

  15. Microbenchmark: Validate Physical Properties

  16. Microbenchmark: Radios per Rack

  17. Microbenchmark: Sensitivity to Hardware

  18. Scheduling: Goal & Challenges • Goal • Maximize efficiency • Minimize wireless interference • Challenges • Require accurate interference model (accumulate interference) • Handle short-lived traffic burst → must be online • Account for antenna rotation delay (0.01s~1s)

  19. Scheduling: Design • Conflict-Degree based Greedy Scheduling • Goal → Minimize job completion time • Graph coloring problem • Color: 60GHz frequency channels & time slots • Link preemption or not? • Minimize antenna rotation overhead

  20. Evaluation: Addressing Traffic Hotspots • Does adding 3D beamforming links to existing wired networks significantly increase available bandwidth for hotspots? • How significant are the benefits of 3D beamforming over 2D beamforming, and where are they most visible? • Will antenna rotation delay of today’s rotators be a performance bottleneck for 3D beamforming?

  21. Evaluation: Flow Completion Time

  22. Future Work • Routing • Traffic management • Priority-based scheduler • Wired/wireless co-scheduling

  23. Related Work • Address traffic congestion • Network architecture design & traffic scheduling • Modeling network traffic characteristics • 60GHz wireless technology • Optical circuit switching

  24. Thank you for listening

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