IPERF_ How to Test Network Speed,Performance,Bandwidth

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IPERF:HowtotestnetworkSpeed,Performance,Bandwidth

SubmittedbySarathPillai(http://plus.google.com/110882921997234815487?rel=author)onMon,02/04/201319:59

Testingnetworkperformanceintermsofspeedandbandwidthisanorminbothproductionandnonproductionenvironment.

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Adetailedreportofspeedandbandwidthanalysisisverymuchnecessaryforthedeploymentofnetworkdependentapplicationservers.Alsosometimesyouneedtodoublecheckthespeedofyournetworkthroughputwhiletroubleshooting.Alltheserequiresareliablenetworkperformancetestingtool.Thispostwillbeconcentratingononesuchtoolcalledas"iperf".

IPERFisanopensourcetoolthatcanbeusedtotestnetworkperformance.Iperfismuchmorereliableinitstestresultscomparedtomanyotheronlinenetworkspeedtestproviders.

AnaddedadvantageofusingIPERFfortestingnetworkperformanceisthefactthat,itisveryreliableifyouhavetwoservers,bothingeographicallydifferentlocations,andyouwanttomeasurenetworkperformancebetweenthem.

Howtoinstalliperf?

Installingiperfisverymucheasy,ifyouhaveepelyumrepositoryenabled(inredhatsystem's).

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[root@slashroot1~]#yuminstalliperf================================================================================PackageArchVersionRepositorySize================================================================================Installing:iperfi3862.0.51.el5epel52k

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Installingiperffromsourceisalsoverymucheasy.JustdownloadtheiperfsourcepackagefromIperfSourcePackage(http://sourceforge.net/projects/iperf/)

Anddoanormalsourceinstallationstepsasfollows.

TheabovecommandwillextractthetarpackageYoudownloadedfromtheabovelink.

Nowgetinsidetheextracteddirectoryandrunthebelowcommandtoconfigure,withthedefaultoptions.

Nowletscompileitwith"make"command,andtheninstallitusing"makeinstall"command.

Howtoinstalliperfinwindowsmachine?

Installingiperfinwindowsisalsoquiteeasy.Letsseehow.

YoucandownloadiperfforwindowsfromIperfForwindows(http://iperf.fr/download/iperf_2.0.5/iperf2.0.52win32.zip).Nowunzipthiszipfiletoafoldernamed"iperf"andruntheiperf.exeinsidethatdirectory.

Forexampleihaveextracted,theiperfzipinC:\iperfdirectory,sowillopentheWindowsCMD,andnavigatetothatdirectory,toruntheiperf.execommand.

1 #tarxvfiperf2.0.5.tar.gz

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[root@slashroot2~]#cdiperf2.0.5[[email protected]]#./configure

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[[email protected]]#make[[email protected]]#makeinstall

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C:\>cdC:\iperfC:\iperf>iperf.exe

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Howtotestthenetworkspeedbetweenonewindowsmachineandalinuxmachine?

Asitoldbefore,iperfcanbeusedtoperformspeedtestbetweenremotemachine's.Itworksinaclientservermodel.

Theoperatingsystemdoesnotmatter,whileyouareusingiperf.Thecommandsforusingiperfonwindowsisexactlythesameasinlinux.Andalsootheroperatingsystem.Normallyinthetestenvironment,iperfclientsendsdatatotheserverforthetest.

Beforegoingaheadwiththetest,letsunderstandsomenetworkingconceptsrelatedtospeedtest.

NetworkThroughput

Transferrateofdatafromoneplacetoanotherwithrespecttotimeiscalledasthroughput.Throughputisconsideredaqualitymeasuringmetricforharddisks,networketc.ItsmeasuredinKbps(Kilobitspersecond),Mbps(Megabitspersecond),Gbps(Gigabitspersecond.)

TCPWindow

TCP(TransmissionControlProtocol),isareliabletransportlayerprotocolusedfornetworkcommunications.HowTCPworks,isbeyondthescopeofthisarticle.TCPworksonareliablemanner,bysendingmessagesandwaitingforacknowledgementfromthereceiver.

Whenevertwomachine'sarecommunicatingwitheachother,theneachofthemwillinformtheother,abouttheamountofbytesitisreadytoreceiveatonetime.

Inotherwords,themaximumamountofdatathatasendercansendtheotherend,withoutanacknowledgementiscalledasWindowSize.ThisTCPwindowsizeaffectsnetworkthroughputverybadlysometimes.Letstakeanexample.

Supposeyouwanttosenda500MBofdatafromonemachinetotheother,withthetcpwindowsizeof



64KB.

Whichmeansforsendingthewhole500MBdata,thesendingmachinehastowait800timesforanacknowledgementfromthereceiver.

500MB/64KB=800

Soyoucanclearlyseethat,ifyouincreasetheWindowsizealittlebittotuneTCP,itcanbringsignificantdifferencetothethroughputachieved.

SupposeyouhaveawindowsmachineandwanttomeasurethespeedbetweenitandanotherLinuxmachine,thenyouneedtomakeoneasclient,andanotherastheserver.Letsseehow.

WewillmakeourwindowsmachinetheserverandtheLinuxmachineastheclient.

Sargumentisusedforspecifyingserver

Theabovecommand,startsiperfserveronthewindowsmachine,anditbydefaultrunsontheport5001bydefault.(ItalsoreportsthatthedefaultTCPwindowsizeis64.0KB).

LetstestthethroughputfromtheLinuxclientmachine,asshownbelow.

Fromtheaboveoutput,youcanseethatigotaspeedof258Mbits/sec.Theouputshowssomethingmore.

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C:\iperf>iperf.exesServerlisteningonTCPport5001TCPwindowsize:64.0KByte(default)

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[root@slashroot2~]#iperfc192.168.0.101Clientconnectingto192.168.0.101,TCPport5001TCPwindowsize:16.0KByte(default)[3]local192.168.0.102port47326connectedwith192.168.0.101port5001[ID]IntervalTransferBandwidth[3]0.010.0sec308MBytes258Mbits/sec

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Interval:Intervalspecifiesthetimedurationforwhichthedataistransferred.

Transfer:Alldatatransferredusingiperfisthroughmemory,andisflushedoutaftercompletingthetest.Sothereisnoneedtoclearthetransferredfileafterthetest.Thiscolumnshowsthetransferreddatasize.

Bandwidth:Thisshowstherateofspeedwithwhichthedataistransferred.

Youcanstartyouriperfserveronyourdesiredportwiththefollowingmethod.

Alsoyoucantelltheclienttoconnecttoyourdesiredserverportandalsotweaksomemoreconnectionandreportingparameter'sasshownbelow.

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C:\iperf>iperf.exesp2000ServerlisteningonTCPport2000TCPwindowsize:64.0KByte(default)

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toptionusedintheabovecommandtellstotransferdatafor20seconds.

pwilltelltheclienttoconnecttheport2000ontheserver

wwillspecifyyourdesiredwindowsizevalue.Asitoldbefore,windowsizetuningwillimproveTCPtransferratetoacertainextent.

Andyoucanclearlyseefromtheaboveoutputthatthebandwidthforthewholetransferhasincreased,aswehaveincreasedthewindowsize(Iamusingtwovirtualmachine'sinonephysicalboxforthisiperfdemonstration,whichisthereasonamgettingexceptionaltransferrate's).

Youcanalsotelltheiperfclienttoshowthetransferrateatanintervalof1second,forthewhole10secondtransfer,asshownbelowwithioption.

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root@slashroot2~]#iperfc192.168.0.101t20p2000w40kClientconnectingto192.168.0.101,TCPport2000TCPwindowsize:80.0KByte(WARNING:requested40.0KByte)[3]local192.168.0.1[02port60961connectedwith192.168.0.101port2000[ID]IntervalTransferBandwidth[3]0.020.0sec1.74GBytes747Mbits/sec

123456789101112131415161718

[root@slashroot2~]#iperfc192.168.0.100P1i1Clientconnectingto192.168.0.100,TCPport5001TCPwindowsize:16.0KByte(default)[3]local192.168.0.102port49597connectedwith192.168.0.100port5001[ID]IntervalTransferBandwidth[3]0.01.0sec28.6MBytes240Mbits/sec[3]1.02.0sec25.9MBytes217Mbits/sec[3]2.03.0sec26.5MBytes222Mbits/sec[3]3.04.0sec26.6MBytes223Mbits/sec[3]4.05.0sec26.0MBytes218Mbits/sec[3]5.06.0sec26.2MBytes220Mbits/sec[3]6.07.0sec26.8MBytes224Mbits/sec[3]7.08.0sec26.0MBytes218Mbits/sec[3]8.09.0sec25.8MBytes216Mbits/sec[3]9.010.0sec26.4MBytes221Mbits/sec[3]0.010.0sec265MBytes222Mbits/sec

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UntilnowwehaveonlyseenthethroughputofoneTCPconnection.Becausewhenyouruniperf,bydefaultifonlycreatesoneTCPconnectionwiththeremoteserver.

YouMighthavenoticedthatsomeinternetDownloadmanager'saresofastwhiletheydownloadanycontentfromtheinternet,comparedtothenormaloperatingsystemdownloader.Themainreasonbehinditisthefactthattheyworkon"ParallelTCPconnections."Onesuchdownloadmanager,thatirememberis"InternetDownload

Manager"(http://www.internetdownloadmanager.com).

Let'scheckthethroughputreportbyincreasingthenumberofparallelconnectionsusing"iperf".

123456789101112131415161718192021222324252627282930

[root@slashroot2~]#iperfc192.168.0.100P20Clientconnectingto192.168.0.100,TCPport5001TCPwindowsize:16.0KByte(default)[15]local192.168.0.102port57258connectedwith192.168.0.100port5001[3]local192.168.0.102port57246connectedwith192.168.0.100port5001[4]local192.168.0.102port57247connectedwith192.168.0.100port5001[5]local192.168.0.102port57248connectedwith192.168.0.100port5001[7]local192.168.0.102port57250connectedwith192.168.0.100port5001[6]local192.168.0.102port57249connectedwith192.168.0.100port5001[10]local192.168.0.102port57253connectedwith192.168.0.100port5001[8]local192.168.0.102port57251connectedwith192.168.0.100port5001[9]local192.168.0.102port57252connectedwith192.168.0.100port5001[16]local192.168.0.102port57259connectedwith192.168.0.100port5001[19]local192.168.0.102port57261connectedwith192.168.0.100port5001[18]local192.168.0.102port57260connectedwith192.168.0.100port5001[20]local192.168.0.102port57262connectedwith192.168.0.100port5001[17]local192.168.0.102port57263connectedwith192.168.0.100port5001[21]local192.168.0.102port57264connectedwith192.168.0.100port5001[11]local192.168.0.102port57254connectedwith192.168.0.100port5001[12]local192.168.0.102port57255connectedwith192.168.0.100port5001[13]local192.168.0.102port57256connectedwith192.168.0.100port5001[14]local192.168.0.102port57257connectedwith192.168.0.100port5001[22]local192.168.0.102port57265connectedwith192.168.0.100port5001[ID]IntervalTransferBandwidth[8]0.010.6sec16.6MBytes13.1Mbits/sec[16]0.010.6sec16.6MBytes13.1Mbits/sec[18]0.010.6sec16.5MBytes13.1Mbits/sec[17]0.010.7sec16.6MBytes13.0Mbits/sec

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Intheaboveshownexampleihavetoldiperfclienttocreate20parallelTCPconnectionstotheremotehostwhilethedatatransfer.Andifobservetheoutput,youcanseeclearlythat20differentportsontheclientisconnectedtothedefault5001portontheserver.

Andalloftheconnectionshaddifferenttransferrate,andattheendwegotacombinedthroughputof266Mbits/s.(WhichismuchbetterthatasingleTCPconnection.)

ConductingaUDPspeedtestiniperf

ConductingaUDPspeedtestusingiperfwillprovideyouwithacoupleofmoreinformationaboutyournetworkwhichwillbeverymuchusefulinfindingnetworkbottlenecks.

Aswediscussedbefore,notonlyTCPwindowsizebutnetworkparameter'slikethefollowingalsoaffectsthethroughputachievedduringaconnectionn.

OutoforderdeliveryNetworkJitterPacketlossoutoftotalnumberofpackets

3132333435363738394041424344454647

[21]0.010.7sec15.6MBytes12.3Mbits/sec[12]0.010.7sec17.5MBytes13.7Mbits/sec[22]0.010.7sec16.6MBytes13.0Mbits/sec[15]0.010.8sec17.8MBytes13.8Mbits/sec[3]0.010.7sec18.5MBytes14.5Mbits/sec[4]0.010.8sec18.1MBytes14.1Mbits/sec[5]0.010.7sec17.6MBytes13.9Mbits/sec[7]0.010.8sec18.4MBytes14.3Mbits/sec[6]0.010.8sec17.0MBytes13.2Mbits/sec[10]0.010.8sec16.8MBytes13.1Mbits/sec[9]0.010.8sec16.8MBytes13.0Mbits/sec[19]0.010.6sec16.5MBytes13.0Mbits/sec[20]0.010.7sec16.5MBytes12.9Mbits/sec[11]0.010.7sec18.0MBytes14.0Mbits/sec[13]0.010.7sec17.8MBytes13.9Mbits/sec[14]0.010.8sec18.2MBytes14.1Mbits/sec[SUM]0.010.8sec344MBytes266Mbits/sec



Forconductionaniperfudptest,youneedtostarttheserverwiththeuoptionsothattheUDPport5001isopenedontheserverside.

NowletsstartthedatatransferfromtheclientsidebysendingUDPtraffic.

Intheaboveexample,ihaveusedboptiontospecifythebandwidthtouse(becausebydefaultiperfUDPonlyused1Mbps,iwillrecommendusingyourfullavailablebandwidthtogetanidea)

uoptionsneedstobealsousedontheclientsideforspecifyingUDPtraffic.

Theouputtellsusthefollowinginformation.

Bandwidth=81.7Mbits/sec

Networkjitter=0.167ms(networkjitteristhedeviationintimeforperiodicarrivalofdatagram's.Ifyouaredoingthetestwithserver'sontheothersideoftheglobe,thenyoumightseehigherjittervaluesiniperfoutput.)

123456

C:\iperf>iperf.exesuServerlisteningonUDPport5001Receiving1470bytedatagramsUDPbuffersize:64.0KByte(default)

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[root@slashroot2~]#iperfc192.168.0.100ub100mClientconnectingto192.168.0.100,UDPport5001Sending1470bytedatagramsUDPbuffersize:107KByte(default)[3]local192.168.0.102port50836connectedwith192.168.0.100port5001[ID]IntervalTransferBandwidth[3]0.010.0sec97.4MBytes81.7Mbits/sec[3]Sent69508datagrams[3]ServerReport:[3]0.010.0sec97.4MBytes81.8Mbits/sec0.167ms49/69507(0.07%)[3]0.010.0sec1datagramsreceivedoutoforder[root@slashroot2~]#

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Ratethisarticle:Average:4.9(23votes)

OutofOrder=1datagram

Lost/Total=49/69508

0.07percentdatagramlossisnotatallsignificant,infactyoucansaythatyougotanicenetworkpacketlossratio.

VOIPrequire'saverylessdatagramlossbecauseitsvoicecommunication.Ahighdatagramlosscandropthecallaltogether.SoUDPtestingwithiperfwillbeverymuchhelpfulifyouhaveVOIPorothersuchcriticalapplicationsonyourinfrastructure.

Youcangetalltheoption'srelatedtoiperfwiththefollowingcommand.

[root@slashroot2~]#iperfhelp

Addacomment...

Commentusing...

BrianCuscinoAlok,youspecificUDPtestwithauonyourtargetcomputer,addthesame"u"optionintotheonesendingcommandandallwillworkwithoutissue.iperfc10.203.3.242uAndthereisnoneedtospecifyportasbothdefaultto5001ReplyLikeJune17,2014at4:30pm

AlokKumarGurgaon,Haryana[root@localhost~]#iperfsuServerlisteningonUDPport5001Receiving1470bytedatagramsUDPbuffersize:224KByte(default)

[root@localhost~]#iperfc10.203.3.242p5001connectfailed:Noroutetohost



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butiamabletoping10.203.3.242fromtheclientside.Whatcouldbethepossiblereasonofthisissue??ReplyLikeJanuary13,2014at5:15am

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MitchellThompsonGlenmorePark,NewSouthWales,AustraliaEasiestwaytodothiswithspeedtest.netservercanbefoundherehttp://vpstip.com/howtospeedtestvpsinlinux/ReplyLikeDecember23,2013at10:55pm

FreddyG.DuranMurilloQuebuenaherramienta.ReplyLikeMarch12,2013at12:08am



Thanks(/comment/483#comment483)

Permalink(/comment/483#comment483)SubmittedbyJeffSweetonWed,11/20/201308:23

Iappreciatethewalkthrough.Gavemesomegoodteststoseeifour1Gbpslinkisperformingasexpected.

[3]local10.139.29.10port33796connectedwith10.98.242.185port5001[ID]IntervalTransferBandwidth[3]0.010.0sec1.11GBytes957Mbits/sec[3]Sent813920datagrams[3]ServerReport:[ID]IntervalTransferBandwidthJitterLost/TotalDatagrams[3]0.010.0sec1.11GBytes957Mbits/sec0.016ms0/813920(0%)

Thiswasmyresults.Prettyhappywiththat.

reply(/comment/reply/41/483)

HiJeff,(/comment/484#comment484)

Permalink(/comment/484#comment484)SubmittedbySarathPillaionWed,11/20/201310:36

HiJeff,

Nicetoknowthatthetutorialwashelpfulinputtingyourlinktotest..

Andyeah..Welcometoslashroot..

Regards




GoodOne(/comment/498#comment498)

Permalink(/comment/498#comment498)SubmittedbysridharonTue,12/10/201315:41

Simple,nicelyexplained


PacketLossinWindows(/comment/565#comment565)

Permalink(/comment/565#comment565)SubmittedbyRomeronWed,02/12/201417:16

Hi,frommytestingonregularwindowsmachines,theUDPperformancewhenusingtwocomputerswithwindows,versus1windows>1linuxandobviouslylinuxlinuxvariesgreatly,notonlydoeswindowsseemtobemuchweakerintermsofachievingstableperformanceandhigherspeeds,above100Mbits,alsothepacketlossphenomenaseemstobemuchhigherwhenawindowsmachineisinvolved,andalsothereisabigdifferencebetweenusingthatwindowsmachineasaserver(weaker)orasiclient.

WhenusingLinuxthereisnopacketloss.Notethatforthespecifictestingi'mindicating,thesetupisjusttwoPCsbacktobackwitha2meterethernetcable.

Isthatconsistentwithyourfindings?

thanks


HiRomer,(/comment/566#comment566)

Permalink(/comment/566#comment566)SubmittedbySarathPillaionWed,02/12/201419:34



HiRomer,

Ifyouareexperiencingveryhighpacketlossinwindowsmachine,itsprobablyaNICdriverissue(providedyouhaverecentlyupgradedyourwindowsorappliedsomehotfix..tryinstallingtheoriginalvendordriver.).AnywaysupgradetheNICdrivertothelateststableversionfromtheofficialnicvendorsite.

Secondlyforachievinghigherspeeds,trytweakingsometcpsettingsonyourwindowsmachine.Likeflowcontrol,RDC,LSOetc.

RegardsSarath


Howtotesttcpcommunicationwithsomepreddefinedpayload(/comment/744#comment744)

Permalink(/comment/744#comment744)SubmittedbyPrakashonTue,06/17/201415:15

Hi,

Hereismycase

Virtualizationhost:Xenserver,2Windows2008R2VM'sOneissambaclientandanotherisservernetviewcommandreturnsafter17secondsdelay

Tcpdumpsuggestsme,thereisretransmissionhappeningoncepayloadincreasesto1464.Whileretransmission,itbreaksthepayload,andthisworks.

Whatiwanttoknow:1)Isthereanyway,icantestthisbehaviourwithiperf.Imeantrytosendthepacketswithmorepayload



2)DOanyoneknowinthissituationwhatallthingscanbetriedtonaildowntheissue?

Thanksforanysaneinsaneadvice.

Prakash


Howtotesttcpcommunicationwithsomepreddefinedpayload(/comment/784#comment784)

Permalink(/comment/784#comment784)SubmittedbyDBAonSat,07/12/201403:35

Didyougetanyanswerstoyourquery?Pleasesharehere.

Thanks&Regards,Teji


UDPtestissue(/comment/924#comment924)

Permalink(/comment/924#comment924)SubmittedbyRogeronTue,10/07/201420:55

hi,wheniusethiscommandiperfc192.168.0.100ub100mtotestUDPperformance,idon'tgetthetrueresult.Andihavethismessagealltime"WARNING:didnotreceiveackoflastdatagramafter10tries"

Ineedyoutohelpmetosolvethisissue



Moreinformationabouttextformats(/filter/tips)

ThanksandbestRegards

Roger


UDPtestissue(/comment/982#comment982)

Permalink(/comment/982#comment982)SubmittedbyStevenonSat,12/06/201402:32

IseethatwheninthepastIlefttheserverinTCP.Makesuretheserverissetupwithiperfsu


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IPERF_ How to Test Network Speed,Performance,Bandwidth

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