Mirror Mirror on the Ceiling: Flexible Wireless Links for Data Centers Presenter: Lu Gong.
-
Upload
stewart-bryan -
Category
Documents
-
view
215 -
download
0
Transcript of Mirror Mirror on the Ceiling: Flexible Wireless Links for Data Centers Presenter: Lu Gong.
![Page 1: Mirror Mirror on the Ceiling: Flexible Wireless Links for Data Centers Presenter: Lu Gong.](https://reader030.fdocuments.net/reader030/viewer/2022032707/56649e195503460f94b0656d/html5/thumbnails/1.jpg)
Mirror Mirror on the Ceiling:Flexible Wireless Links for Data Centers
Presenter: Lu Gong
![Page 2: Mirror Mirror on the Ceiling: Flexible Wireless Links for Data Centers Presenter: Lu Gong.](https://reader030.fdocuments.net/reader030/viewer/2022032707/56649e195503460f94b0656d/html5/thumbnails/2.jpg)
About Authors
![Page 3: Mirror Mirror on the Ceiling: Flexible Wireless Links for Data Centers Presenter: Lu Gong.](https://reader030.fdocuments.net/reader030/viewer/2022032707/56649e195503460f94b0656d/html5/thumbnails/3.jpg)
About Authors: Xia Zhou
• PhD candidate, UCSB• Fields:
Networks & Communications, Mathematics, Microbiology
![Page 4: Mirror Mirror on the Ceiling: Flexible Wireless Links for Data Centers Presenter: Lu Gong.](https://reader030.fdocuments.net/reader030/viewer/2022032707/56649e195503460f94b0656d/html5/thumbnails/4.jpg)
About Authors: Zengbin Zhang
• PhD candidate, UCSB• Fields: Wireless Systems and Networking, Mobile
Computing and Distributed Systems
![Page 5: Mirror Mirror on the Ceiling: Flexible Wireless Links for Data Centers Presenter: Lu Gong.](https://reader030.fdocuments.net/reader030/viewer/2022032707/56649e195503460f94b0656d/html5/thumbnails/5.jpg)
About Authors: Yibo Zhu
• PhD candidate, UCSB• Fields: Data Center Networks, Mobile
Networks and Online Social Networks
![Page 6: Mirror Mirror on the Ceiling: Flexible Wireless Links for Data Centers Presenter: Lu Gong.](https://reader030.fdocuments.net/reader030/viewer/2022032707/56649e195503460f94b0656d/html5/thumbnails/6.jpg)
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
![Page 7: Mirror Mirror on the Ceiling: Flexible Wireless Links for Data Centers Presenter: Lu Gong.](https://reader030.fdocuments.net/reader030/viewer/2022032707/56649e195503460f94b0656d/html5/thumbnails/7.jpg)
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
![Page 8: Mirror Mirror on the Ceiling: Flexible Wireless Links for Data Centers Presenter: Lu Gong.](https://reader030.fdocuments.net/reader030/viewer/2022032707/56649e195503460f94b0656d/html5/thumbnails/8.jpg)
Existing works
• Signal leakage→ limits the concurrent active links
• Line-of-sight requirement→ limits the effective range of links
![Page 9: Mirror Mirror on the Ceiling: Flexible Wireless Links for Data Centers Presenter: Lu Gong.](https://reader030.fdocuments.net/reader030/viewer/2022032707/56649e195503460f94b0656d/html5/thumbnails/9.jpg)
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
![Page 10: Mirror Mirror on the Ceiling: Flexible Wireless Links for Data Centers Presenter: Lu Gong.](https://reader030.fdocuments.net/reader030/viewer/2022032707/56649e195503460f94b0656d/html5/thumbnails/10.jpg)
Beamforming
• A physical layer technique to concentrate transmission energy in a specific direction
![Page 11: Mirror Mirror on the Ceiling: Flexible Wireless Links for Data Centers Presenter: Lu Gong.](https://reader030.fdocuments.net/reader030/viewer/2022032707/56649e195503460f94b0656d/html5/thumbnails/11.jpg)
Testbed of link blockage
![Page 12: Mirror Mirror on the Ceiling: Flexible Wireless Links for Data Centers Presenter: Lu Gong.](https://reader030.fdocuments.net/reader030/viewer/2022032707/56649e195503460f94b0656d/html5/thumbnails/12.jpg)
Testbed of radio interference
![Page 13: Mirror Mirror on the Ceiling: Flexible Wireless Links for Data Centers Presenter: Lu Gong.](https://reader030.fdocuments.net/reader030/viewer/2022032707/56649e195503460f94b0656d/html5/thumbnails/13.jpg)
3D Beamforming
• Components:– Beamforming Radios– Ceiling Reflectors– Electromagnetic Absorbers
• Prevent local reflections and scattering
![Page 14: Mirror Mirror on the Ceiling: Flexible Wireless Links for Data Centers Presenter: Lu Gong.](https://reader030.fdocuments.net/reader030/viewer/2022032707/56649e195503460f94b0656d/html5/thumbnails/14.jpg)
Testbed of 3D Beamforming
![Page 15: Mirror Mirror on the Ceiling: Flexible Wireless Links for Data Centers Presenter: Lu Gong.](https://reader030.fdocuments.net/reader030/viewer/2022032707/56649e195503460f94b0656d/html5/thumbnails/15.jpg)
Microbenchmark: Validate Physical Properties
![Page 16: Mirror Mirror on the Ceiling: Flexible Wireless Links for Data Centers Presenter: Lu Gong.](https://reader030.fdocuments.net/reader030/viewer/2022032707/56649e195503460f94b0656d/html5/thumbnails/16.jpg)
Microbenchmark: Radios per Rack
![Page 17: Mirror Mirror on the Ceiling: Flexible Wireless Links for Data Centers Presenter: Lu Gong.](https://reader030.fdocuments.net/reader030/viewer/2022032707/56649e195503460f94b0656d/html5/thumbnails/17.jpg)
Microbenchmark: Sensitivity to Hardware
![Page 18: Mirror Mirror on the Ceiling: Flexible Wireless Links for Data Centers Presenter: Lu Gong.](https://reader030.fdocuments.net/reader030/viewer/2022032707/56649e195503460f94b0656d/html5/thumbnails/18.jpg)
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)
![Page 19: Mirror Mirror on the Ceiling: Flexible Wireless Links for Data Centers Presenter: Lu Gong.](https://reader030.fdocuments.net/reader030/viewer/2022032707/56649e195503460f94b0656d/html5/thumbnails/19.jpg)
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
![Page 20: Mirror Mirror on the Ceiling: Flexible Wireless Links for Data Centers Presenter: Lu Gong.](https://reader030.fdocuments.net/reader030/viewer/2022032707/56649e195503460f94b0656d/html5/thumbnails/20.jpg)
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?
![Page 21: Mirror Mirror on the Ceiling: Flexible Wireless Links for Data Centers Presenter: Lu Gong.](https://reader030.fdocuments.net/reader030/viewer/2022032707/56649e195503460f94b0656d/html5/thumbnails/21.jpg)
Evaluation: Flow Completion Time
![Page 22: Mirror Mirror on the Ceiling: Flexible Wireless Links for Data Centers Presenter: Lu Gong.](https://reader030.fdocuments.net/reader030/viewer/2022032707/56649e195503460f94b0656d/html5/thumbnails/22.jpg)
Future Work
• Routing• Traffic management• Priority-based scheduler• Wired/wireless co-scheduling
![Page 23: Mirror Mirror on the Ceiling: Flexible Wireless Links for Data Centers Presenter: Lu Gong.](https://reader030.fdocuments.net/reader030/viewer/2022032707/56649e195503460f94b0656d/html5/thumbnails/23.jpg)
Related Work
• Address traffic congestion– Network architecture design & traffic scheduling– Modeling network traffic characteristics
• 60GHz wireless technology• Optical circuit switching
![Page 24: Mirror Mirror on the Ceiling: Flexible Wireless Links for Data Centers Presenter: Lu Gong.](https://reader030.fdocuments.net/reader030/viewer/2022032707/56649e195503460f94b0656d/html5/thumbnails/24.jpg)
Thank you for listening