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1、OverheadandPerformanceStudyoftheGeneralInternetSignalingTransport(GIST)ProtocolXiaomingFu?,HenningSchulzrinne?,HannesTschofenig?,ChristianDickmann?,andDieterHogrefe??InstituteforInformatics,UniversityofGottingen,Germany,Email:¨{fu,cdickman,hogrefe}@cs.uni-goettingen.de?Departm
2、entofComputerScience,ColumbiaUniversity,NewYork,USA,Email:hgs@cs.columbia.edu?SiemensAG,Munich,Germany,Email:hannes.tschofenig@siemens.comAbstractTheGeneralInternetSignalingTransport(GIST)duceoverhead,improveperformance,orextendthesignalingprotocoliscurrentlybeingdevelopedasth
3、ebaseprotocolschemetosupportmobility.TheseextensionsarebasedonthecomponentintheIETFNextStepsInSignaling(NSIS)protocolideaofdiscoveringQoS-awarenodesalongthedatapathbystacktosupportavarietyofsignalingapplications.Inthispaperusingend-to-endaddressedmessages(mostlyequippedwithwep
4、resentourstudyontheprotocoloverheadandperformanceaspectsofGIST.Wequantifynetwork-layerprotocoloverheadaRouterAlertoption)thatdeliverQoSparametersandrelyandobservetheeffectsofenhancedmodularityandsecurityinona?owidenti?ertoselectasignalingsessionstate.InGIST.Wedevelopeda?rstope
5、nsourceGISTimplementationaddition,protocolcomplexityhasbeenissuesespeciallydueattheUniversityofGottingen,andstudyitsperformanceina¨tothesupportformulticast?ows[20].ThesedesignprinciplesLinuxtestbed.AGISTnodeserving45,000signalingsessionshavebeenasourceoflimited?exibility,secur
6、ityandmobility.isfoundtoconsumesmallamountsofCPUandmemory(onaverage1.1msforprocessingasignalingmessageand2.4KBMoreimportantly,althoughtheseapproachesindividuallymaymemoryforasession).IndividualroutinesintheGISTcodearemeettheneedsofcertainsignalingpurposes,theylackaninstrumente
7、dtoobtainadetailedpro?leoftheircontributionstoextensibleframeworkwhichallowseasyextensionsforfuturetheoverallsystemprocessing.Importantfactorsindeterminingsignalingapplications.Thus,theseapproachesrequireashiftperformance,suchasthenumberofsessions,statemanagement,toanewgeneric
8、signalingparadigmforIPnetworks.Inrefreshfrequency,timermanage
