p4p 可持续发展的必由之路

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1、P4P：P2P产业可持续发展的必经之路谢海永博士，首席研究员美国分布式计算工业联盟(DCIA)P4P工作组(P4PWorkingGroup)haiyong.xie@openp4p.net09/25/2008P4P、P2P、BT互联网视频产业研讨会2OutlineProblemStatementRequirementsandChallengesTheP4PFrameworkObjectiveArchitecturePerformanceP4PWorkingGroupHistory,StructureNextSteps09/25/2008P4P、P2P、BT互联网视频产业研讨会3P2PBa

2、ndwidthUsageCacheLogicResearchInternetProtocolBreakdown1993-2006TrafficUpto60-70%ofInternettrafficiscontributedbyP2Papplications[CacheLogic]RandompeeringcausestrafficspreadacrossPoPsanddomainsProblemsIncreasednetworkresourceusage(e.g.,usingbandwidthofmorelinks)IncreasednetworkoperationalcostsDeg

3、radedperformanceofotherapplications09/25/2008P4P、P2P、BT互联网视频产业研讨会4Thebattleresultsinalose-losesituationBandwidthBattleISPsApproachesUpgradenetworkinfrastructureDeployP2PcachingdevicesTerminateuserconnectivityRate-limitP2Ptraffic……P2PCountermeasuresUserandomportsHidebyusingwell-knownportsEncryptt

4、raffic……GovernmentNetworkNeutrality09/25/2008P4P、P2P、BT互联网视频产业研讨会5TheFundamentalProblemTraditionalISPfeedback/controlstoapplicationtraffic:RoutingRatecontrolthroughcongestionfeedback(e.g.,packetloss)TheseareineffectiveforP2PP2Ptrafficishighlydynamicandscattered,duetodynamic,unguided(network-obli

5、vious)peerselectionNeedamechanismforISPstocommunicatewithP2Paboutnetworkstructureandpolicies09/25/2008P4P、P2P、BT互联网视频产业研讨会Solution:堙堵or疏导？问题：当尧之时，天下犹未平。洪水横流，泛滥于天下。草木畅茂，禽兽繁殖。禽兽逼人，兽蹄鸟迹之道交于中国方法一：堙堵。鲧堙洪水，汨陈其五行。帝乃震怒，不畀其洪范九畴，彝伦攸。鲧则殛死，禹乃嗣兴方法二：疏导。禹疏九河，沦济漯而注诸海，决汝汉排淮泗而注之江，然后中国可得而食也。当是时也，禹八年于外，三过家门而不入，虽欲耕，

6、得乎09/25/2008P4P、P2P、BT互联网视频产业研讨会7SolutionRequirements&ChallengesEfficiencyISPs:betternetworkutilizationP2Ps:higherperformanceEnd-users:betterexperiencesNation:lessexpensesinupgradinginfrastructure09/25/2008P4P、P2P、BT互联网视频产业研讨会8SolutionRequirements&ChallengesExtensibilityUniversallyapplicabletomo

7、stP2ParchitecturesTracker-basedandtrackerlessP2PsystemsEasilyextensibletohandleapplication-specificrequirementsFilesharingvs.streaming,Commercialvs.non-commercialAlloweasyentryofnewapplications09/25/2008P4P、P2P、BT互联网视频产业研讨会9