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Shoal: A Lossless Network for High-density and Disaggregated Racks

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dc.contributor.authorShrivastav, Vishal
dc.contributor.authorValadarsky, Asaf
dc.contributor.authorBallani, Hitesh
dc.contributor.authorCosta, Paolo
dc.contributor.authorLee, Ki Suh
dc.contributor.authorWang, Han
dc.contributor.authorAgarwal, Rachit
dc.contributor.authorWeatherspoon, Hakim
dc.date.accessioned2017-05-08T01:24:32Z
dc.date.available2017-05-08T01:24:32Z
dc.date.issued2017-04-30
dc.description.abstractRack-scale computers comprise hundreds of micro-servers connected to internal storage and memory through an internal network. However, their density and disaggregated nature pose a problem for existing packet-switched networks: they are too costly, draw too much power, and the network latency is too high for converged traffic (comprising IP, storage, and memory traffic). We propose Shoal, a rack-scale network that tightly integrates a circuit-switched physical fabric with the nodes’ network stack to efficiently support converged traffic. Shoal’s fabric comprises circuit switches with no buffers, no arbitration, and no packet inspection mechanism. Micro-servers transmit according to a static schedule such that there is no in-network contention. Shoal’s congestion control leverages the physical fabric to achieve fairness, losslessness, and both bounded worst-case throughput and queuing. We use an FPGA-based prototype and simulations to illustrate Shoal’s mechanisms are practical and achieve low latency within the rack at low cost and power.en_US
dc.description.sponsorshipThis research is partially supported by DARPA CSSG (D11AP00266), NSF (1053757, 1440744, and 1422544), European Union’s Horizon 2020 research and innovation programme under the SSICLOPS project (agreement No. 644866), and with gifts from Cisco, Altera, and Bluespecen_US
dc.identifier.urihttps://hdl.handle.net/1813/49647
dc.subjectDatacentersen_US
dc.subjectRack-scale Computersen_US
dc.subjectDisaggregated resourcesen_US
dc.subjectDisaggregated systemsen_US
dc.subjectComputer networksen_US
dc.titleShoal: A Lossless Network for High-density and Disaggregated Racksen_US
dc.typetechnical reporten_US

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