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1、AchievingReliableHighPerformanceinLFNsSvenUbik,andPavelCimbal,CESNET,Prague,CzechRepublicAbstract—Bothwindows(rwinandcwnd)canextendonlyThePChardwarearchitectureandcommodityop-uptothesizeoftheTCPbufferontherespectivesideeratingsystemss
2、uchasLinuxorMicrosoftWindowsoftheconnection.Thedefaultsizeofsenderandre-aredominantinend-hostinfrastructureinthecurrentceiverTCPbuffersinmostcommodityoperatingsys-Internet.Itshowsthatmanyperformanceproblemstemsis64kB.ThisisinsufficientforLFNs,whichre-inhigh-speedlong-dist
3、ancenetworks(alsocalledlong-quirehighvolumeofoutstandingdatatoachievehighfatnetworksorLFNsduetohighpossiblevolumeofoutstandingdatabetweenthesenderandreceiver)areperformance.causedbyimproperbehaviourofendhosts,ratherthanInmostcases,increasingthesizeofTCPbuffersbythenetwor
4、kitself.Understandingofthebehaviourhelpstoincreasethroughput.Severaltoolshavebeenofnetworkingsupportincommodityoperatingsystems,developedintheformofkernelpatchesordaemonstonetworkingapplications,theirmutualinteractionandhelpfindbuffersizesrequiredforparticularnetworktheir
5、interactionwithacomputernetworkisnecessaryconditions[1],[2],[9].However,evenwiththesetoidentifyandresolvetheseproblems.OurgoalistotoolspropersettingofTCPbuffersisaprocedurere-identifythemostsignificantproblemsandsuggestpos-siblesolutions.ManyadvancedInternetusers,requir-q
6、uiringalotofmanualinstallationandconfiguration.inghighnetworkperformance,usetheLinuxoperatingTherefore,automatictuningshouldbeimplementedsystem.Therefore,wedecidedtoconcentrateonnet-bydefaultinfutureversionsofcommodityoperatingworkingsupportinLinux.Particularly,wewillshow
7、systems.thatjustsettinglargeTCPbuffersandmodifyingTCPHowever,thistuningshouldnotonlysavemem-congestioncontrolAIMDparametersisnotsufficientorybynotallocatinglargebuffersbydefaultforalltoreliablyachievehighthroughput.WewillshowthatconnectionsandcareaboutTCPwindowstobelarges
8、martwindowsizemoderationisrequirednottoallowtoolargeTCPwindows.Wewillalsodescribeanim-enough.Itshouldal
