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1、ImprovingTrafficLocalityinBitTorrentviaBiasedNeighborSelectionRuchirBindal,PeiCaoandWilliamChanDepartmentofComputerScience,StanfordUniversityrbindal@stanford.eduJanMedval,GeorgeSuwala,TonyBates,AmyZhangCiscoSystems,Inc.Abstract—Peer-to-peer(P2P)applicationssuchasBitTorre
2、ntUnfortunately,currentimplementationsofBitTorrentignoreignoretrafficcostsatISPsandgeneratealargeamountofcross-theunderlyingInternettopologyorISPlinkcosts,andsetupISPtraffic.Asaresult,ISPsoftenthrottleBitTorrenttrafficdatatransfersamongrandomlychosensetsofpeersdistributeda
3、sawaytocontrolthecost.Inthispaper,weexamineanewaroundtheInternet.Asaresult,theygenerateasignificantapproachtoenhanceBitTorrenttrafficlocality,biasedneighborselection,inwhichapeerchoosesthemajority,butnotall,ofitsamountofcross-ISPtrafficandincreasetheoperatingcostofneighbor
4、sfrompeerswithinthesameISP.Usingsimulations,weanISPsignificantly.showthatbiasedneighborselectionmaintainsthenearlyoptimalThemethodmostoftendeployedbyISPstocontrolBit-performanceofBitTorrentinavarietyofenvironments,andTorrenttrafficis“throttling”,orbandwidthlimiting.Sincef
5、undamentallyreducesthecross-ISPtrafficbystoppingitfromBitTorrenttraffictypicallyrunsoverafixedrangeofportsgrowinglinearlywiththenumberofpeers.Akeyreasonforitsperformanceistherarestfirstpiecereplicationalgorithm(6881to6889)[Coh05]andusesformatseasytodecode,usedbyBitTorrentcl
6、ients.Comparedwithexistinglocality-trafficshapingdevicessuchas[Pac],[Inc],[PC],[San]areenhancingapproachessuchasbandwidthlimiting,gatewaypeers,deployedtolimittheamountofbandwidthconsumedbytheandcaching,biasedneighborselectionrequiresnodedicatedBitTorrentprotocol.However,
7、themaineffectofthrottlingisserversandscalestoalargenumberofBitTorrentnetworks.toslowdownthecontenttransfer.ItdoesnotaddresstheFurthermore,itcanbecombinedwithbandwidthlimitingandcachingtoimprovetheirperformancefurther.fundamentalconcernoftheISP,whichistoimprovethelocalit
8、y(i.e.reducethecross-ISPtraffic)ofthosetransfers.Keywords:Peer-to-Peer,BitTorrent,performance,trafficAsaresult,t
