移动互联网高级分析 Performance evaluation of radio access selection strategies in constrained .doc

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1、DesignandimplementationofaprotocoloffloadengineforTCP/IPandremotedirectmemoryaccessbasedonhardware/softwarecoprocessing  OriginalResearchArticleMicroprocessorsandMicrosystemsThispaperpresentsthedesignandimplementationofaprotocoloffloadenginethatproces

2、sesTCP/IPandremotedirectmemoryaccess(RDMA)protocolsbymeansofhardware/softwarecoprocessing.Intheoffloadengine,time-consumingoperationssuchasTCP/IPheadergenerationareimplementedashardwaretoimproveperformance.ThesoftwareperformscontroloperationsandRDMAhe

3、adergeneration.Intheexperimentsandanalyses,itisprovedthatthehardwarecanprovidesatisfactoryperformancetoprocessalloperationsatspeedsofover1 Gbps.Ourenginecanoffloadmostprotocolprocessingoverheads–upto95%to100%–fromthehostCPU.Finally,althoughtheembedded

4、processorsoperatewitha300 MHzclockthatisseventimesslowerthantheclockofthehostCPU,ourengineshowsmaximumbandwidthsof673 MbpsforTCP/IPand551 MbpsforRDMAonagigabitEthernetnetwork.ArticleOutline1.Introduction1.1.OverviewofRDMAandTCP/IPoffloading1.2.RDMA/TC

5、P/IPoffloadengine1.3.Contribution1.4.Organization2.Relatedworks3.Designandimplementationofprotocoloffloadengine3.1.Overviewofprotocoloffloadengine3.2.ImplementationofTCP/IPoffloadengine3.2.1.HybridarchitectureforTCP/IPoffloadengine3.2.2.Implementation

6、ofhardwareandsoftware3.2.3.Hardware/softwarecoprocessing3.3.Offloadingofremotedirectmemoryaccess3.4.TheRTOEadapterandthesoftwareinterfaceonthehostCPU4.Experimentsandanalyses4.1.PerformanceevaluationsofTCP/IPoffloading4.2.PerformanceanalysesofTCP/IPoff

7、loading4.3.PerformanceevaluationsofRDMAoffloading5.ConclusionsAcknowledgementsTrendsinthedevelopmentofcommunicationnetworks:Cognitivenetworks  OriginalResearchArticleComputerNetworksOneofthemainchallengesalreadyfacedbycommunicationnetworksistheefficie

8、ntmanagementofincreasingcomplexity.Therecentlyproposedconceptofcognitivenetworkappearsasacandidatethatcanaddressthisissue.Inthispaper,wesurveytheexistingresearchworkoncognitivenetworks,aswellasrelatedandenablingtechniquesandtechnologies.Westar