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dc.contributor.authorPérez, Iván
dc.contributor.authorVallejo, Enrique
dc.contributor.authorBeivide, Ramón
dc.contributor.otherBarcelona Supercomputing Center
dc.date.accessioned2021-05-14T16:37:21Z
dc.date.available2022-07-02T00:27:23Z
dc.date.issued2020
dc.identifier.citationPérez, I.; Vallejo, E.; Beivide, R. Efficient bypass in mesh and torus NoCs. "Journal of Systems Architecture (JSA)", 2020, vol. 108, 101832.
dc.identifier.issn1383-7621
dc.identifier.otherhttps://arxiv.org/abs/2012.05136
dc.identifier.urihttp://hdl.handle.net/2117/345640
dc.description.abstractMinimizing latency and power are key goals in the design of NoC routers. Different proposals combine lookahead routing and router bypass to skip the arbitration and buffering, reducing router delay. However, the conditions to use them requires completely empty buffers in the intermediate routers. This restricts the amount of flits that use the bypass pipeline especially at medium and high loads, increasing latency and power. This paper presents NEBB, Non-Empty Buffer Bypass, a mechanism that allows to bypass flits even if the buffers to bypass are not empty. The mechanism applies to wormhole and virtual-cut-through, each of them with different advantages. NEBB-Hybrid is proposed to employ the best flow control in each situation. The mechanism is extended to torus topologies, using FBFC and shared buffers. The proposals have been evaluated using Booksim, showing up to 75% reduction of the buffered flits for single-flit packets, which translates into latency and dynamic power reductions of up to 30% and 23% respectively. For bimodal traffic, these improvements are 20 and 21% respectively. Additionally, the bypass utilization is largely independent of the number of VCs when using shared buffers and very competitive with few private ones, allowing to simplify the allocation mechanisms.
dc.description.sponsorshipThis work was supported by the Spanish Ministry of Science, Innovation and Universities, FPI grant BES-2017-079971, the Spanish Ministry of Science, Innovation and Universities under contract TIN2016-76635-C2-2-R (AEI/FEDER, UE) and the European HiPEAC Network of Excellence. The Mont-Blanc project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 671697
dc.language.isoeng
dc.publisherElsevier
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Spain
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.subjectÀrees temàtiques de la UPC::Informàtica
dc.subject.otherHybrid flow control
dc.subject.otherNoC
dc.subject.otherBypass router
dc.titleEfficient bypass in mesh and torus NoCs
dc.typeArticle
dc.subject.lemacrouters
dc.identifier.doi10.1016/j.sysarc.2020.101832
dc.description.peerreviewedPeer Reviewed
dc.relation.publisherversionhttps://www.sciencedirect.com/science/article/pii/S1383762120301247#!
dc.rights.accessOpen Access
dc.description.versionPostprint (author's final draft)
dc.relation.projectidinfo:eu-repo/grantAgreement/EC/H2020/671697/EU/Mont-Blanc 3, European scalable and power efficient HPC platform based on low-power embedded technology/Mont-Blanc 3
local.citation.other101832
local.citation.publicationNameJournal of Systems Architecture (JSA)
local.citation.volume108


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