direct cache access for high bandwidth network io

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1、DirectCacheAccessforHighBandwidthNetworkI/ORamHuggahalliRaviIyerScottTetrickIntelCorporationIntelCorporationIntelCorporationram.huggahalli@intel.comravishankar.iyer@intel.comscott.tetrick@intel.comAbstractapplications(e.g.webservicesande-commerce).Therel

2、evanceofTCP/IPprotocolprocessing[1,2,3,6,9]RecentI/OtechnologiessuchasPCI-ExpressandgrowsstrongerasStorage-over-IPstartstobecome10GbEthernetenableunprecedentedlevelsofI/OpopularwiththehelpofworkinggroupsforiSCSI[7],bandwidthsinmainstreamplatforms.However

3、,inRDMA[13]andDDP[15].Independentofthevolumeoftraditionalarchitectures,memorylatencyalonecanlimitdatapresentedbyvideoandgraphicsdata,traditionalprocessorsfrommatching10GbinboundnetworkI/Odisk-intensiveworkloadsmayalsobedependentontraffic.Weproposeaplatfo

4、rm-widemethodcalledDirectEthernetcapabilityandefficientTCP/IPprocessingintheCacheAccess(DCA)todeliverinboundI/Odatadirectlyfuture.intoprocessorcaches.WedemonstratethatDCAprovidesasignificantreductioninmemorylatencyandRequiredPacketServiceTimes&Ratesat10G

5、b/smemorybandwidthforreceiveintensivenetworkI/OPacketServiceTime(ns)PacketRateapplications.Analysisofbenchmarkssuchas160016SPECWeb9,TPC-WandTPC-Cshowsthatoverall64BpacketsbenefitdependsontherelativevolumeofI/Otomemory120012trafficaswellasthespatialandtem

6、poralrelationshipbetweenprocessorandI/Omemoryaccesses.Asystem8008levelperspectivefortheefficientimplementationofDCA1518Bpackets4004PacketRateispresented.PktServiceTime(nanoseconds)(MillionPkts/sec)001.Introduction0256512768102412801536Architecturalandmic

7、ro-architecturalevaluationofPacketSize(Bytes)processors,cachehierarchiesandsysteminterconnectshasoftenbeendecoupledfromI/Oconsiderations.ThereareFigure1.ExpectedPacketServiceTimeandmultiplerecenttrendsthatrequireabroaderviewofPacketRatesat10Gb/sversusPac

8、ketSizecomputerarchitecture.ForemostamongthesetrendsisFigure1illustratesthatadatarateof10Gb/stherapidmaturityoftheinternetandthecorrespondingcorrespondstoapacketrateof14.8millionpacketsperincreaseinapplicationsandtechnolog