UEC 1.0 技术深度解析.pdf

1、UEC 1.0 Technical Deep DiveUltra Ethernet ConsortiumTechnical Deep Dive UEC 1.0J Metz,Ph.DChair/Ultra EthernetNETWORKINGAs performantas a supercomputing interconnectAs ubiquitousand cost-effectiveas EthernetAs scalableas a cloud data centerTHE NEW ERANEEDS A NEW NETWORKOutline4321Who is UEC,and Why?

2、The UEC Philosophy/SolutionThe UEC Theory of OperationSummaryFull Standards Development Organization(One of the?)Fastest growing projects in Linux Foundation130+Companies1500+individual active contributor volunteers8 WorkgroupsPhysical Link LayerTransportSoftwareStorageManagementCompliance&TestPerfo

3、rmance&DebugWho is UEC?And Why?Backwards-compatibleUses libfabric as its north-bound APIDesigned to integrate into existing frameworks where libfabricis commonly utilizedKey driving force is in the Ultra Ethernet Transport(UET)UEC Standing on the Shoulders of Giants6Software APILibfabrics 2.0 with e

4、xtensionsNew Transport LayerMulti-pathing Packet sprayingOrdered(ROD)and un-ordered(RUD)Lossy(no PFC)or LosslessCongestion Control:Enhanced Tx and new Rx TrimmingIn Network CollectiveNetwork LayerIP v4/v6ECNData Link LayerNegotiation LLDPLink Level Retry-LLRHeader Efficiency ImprovementsPhysical Lay

5、erIEEE Compliant 100G SignalingAI and HPC ProfilesMore important conceptsSES exchanges messagesmessagesPDS exchanges packetspackets over Packet Delivery Contexts(PDCsPDCs)PDCs are ephemeral connections and have multiple reliability modesROD,RUD,RUDI,UUDROD,RUD,RUDI,UUDCMS allows packets spraying acr

6、oss the fabricThe fabric can be losslesslossless or bestbest-efforteffortLink and PHY reliability features aim to eliminate retransmissionsMore System View and NomenclatureTransport OverviewSemantics Sublayer(SES)Packet Delivery Sublayer(PDS)Congestion Management Sublayer(CMS)Tra