Lub sij hawm latency yog hais txog ntau yam kev ncua uas feem ntau tshwm sim hauv kev ua cov ntaub ntawv network. Ib qho kev sib txuas qis-latency network tau ntsib lub sijhawm qeeb me me, thaum qhov kev sib txuas siab latency muaj kev ncua ntev.
Dhau li ntawm kev nthuav tawm qeeb, latency kuj tseem tuaj yeem cuam tshuam kev sib kis qeeb (cov khoom ntawm lub cev nruab nrab) thiab kev ua haujlwm qeeb (xws li dhau los ntawm cov servers npe lossis ua lub network hops hauv is taws nem).
Latency thiab Network Ceev
Txawm tias qhov kev nkag siab ntawm kev sib txuas ceev thiab kev ua haujlwm feem ntau yog to taub li bandwidth, latency yog lwm qhov tseem ceeb. Tus neeg nruab nrab tau paub ntau dua nrog lub tswv yim ntawm bandwidth vim qhov ntawd yog qhov ntsuas uas cov tuam txhab tsim khoom siv network feem ntau tshaj tawm. Txawm li cas los xij, latency tseem ceeb sib npaug rau cov neeg siv khoom kawg. Hauv cov lus slang, lo lus lag feem ntau hais txog kev ua haujlwm tsis zoo ntawm lub network.
Latency Versus throughput
Ntawm DSL thiab cable internet sib txuas, latencies tsawg dua 100 milliseconds (ms) yog qhov qub, thiab tsawg dua 25 ms feem ntau ua tau. Nrog rau kev sib txuas hauv internet satellite, ntawm qhov tod tes, latencies ib txwm tuaj yeem yog 500 ms lossis siab dua.
Ntau dhau latency tsim cov kab nrib pleb uas tiv thaiv cov ntaub ntawv los ntawm kev sau cov yeeb nkab hauv lub network, yog li txo qis thiab txo qhov siab tshaj plaws bandwidth ntawm kev sib txuas. Qhov cuam tshuam ntawm latency ntawm lub network throughput tuaj yeem yog ib ntus (ntev li ob peb feeb) lossis tsis tu ncua (tsis tu ncua), nyob ntawm qhov chaw ntawm qhov qeeb.
Txawm hais tias qhov theoretical ncov bandwidth ntawm kev sib txuas hauv lub network tau kho raws li cov cuab yeej siv, cov ntaub ntawv tiag tiag uas ntws hla lub network (hu ua throughput) sib txawv raws sijhawm thiab cuam tshuam los ntawm ntau dua thiab qis dua latencies.
Latency of Internet Services
Ib qho kev pabcuam hauv is taws nem ntawm 100 Mbps tuaj yeem ua qhov tsis zoo tshaj qhov kev pabcuam ntsuas ntawm 20 Mbps yog tias nws khiav nrog siab latency.
Satellite internet kev pabcuam qhia txog qhov sib txawv ntawm latency thiab bandwidth ntawm computer networks. Satellite muaj ob qho tib si siab bandwidth thiab siab latency. Thaum thauj cov nplooj ntawv web, piv txwv li, cov neeg siv satellite feem ntau pom qhov qeeb qeeb txij thaum lawv nkag mus rau qhov chaw nyob mus rau lub sijhawm nplooj ntawv pib thauj khoom.
Qhov siab latency no feem ntau yog vim kev nthuav tawm qeeb raws li cov lus thov taug kev ntawm lub teeb nrawm mus rau qhov chaw nres tsheb satellite nyob deb thiab rov qab mus rau lub tsev network. Txawm li cas los xij, ib zaug cov lus tuaj txog hauv ntiaj teb, nplooj ntawv thauj khoom sai, zoo li ntawm lwm qhov kev sib txuas hauv internet siab (xws li DSL thiab cable internet).
Software thiab Device Latency
WAN latency tshwm sim thaum lub network tsis khoom nrog kev khiav mus rau qhov chaw uas lwm qhov kev thov raug ncua vim tias cov khoom siv tsis tuaj yeem ua txhua yam ntawm qhov siab tshaj plaws. Qhov no cuam tshuam rau lub network txuas, ib yam nkaus, vim tias tag nrho lub network ua haujlwm ua ke.
Ib qho yuam kev lossis lwm yam teeb meem nrog lub hardware tuaj yeem ua rau lub sijhawm nws siv rau kho vajtse nyeem cov ntaub ntawv, uas yog lwm qhov laj thawj rau latency. Qhov no tej zaum yuav yog rooj plaub rau lub network hardware lossis cov cuab yeej kho vajtse, zoo li lub hard drive qeeb uas siv sijhawm los khaws lossis khaws cov ntaub ntawv.
Lub software khiav ntawm lub kaw lus tuaj yeem ua rau latency, ib yam nkaus. Qee cov kev pab cuam antivirus tshuaj xyuas tag nrho cov ntaub ntawv uas ntws hauv thiab tawm ntawm lub computer, uas yog vim li cas qee lub khoos phis tawj tiv thaiv qeeb dua lawv cov counterparts. Cov ntaub ntawv txheeb xyuas feem ntau torn sib nrug thiab luam theej ua ntej nws siv tau.
ntsuas Network Latency
Network cov cuab yeej xws li ping tests thiab traceroute ntsuas latency los ntawm kev txiav txim siab lub sij hawm nws yuav siv sij hawm ib tug muab network packet taug kev los ntawm qhov chaw mus rau qhov chaw thiab rov qab, hu ua round-trip lub sij hawm. Lub sijhawm ncig mus ncig yog qhov ntsuas ntawm latency, thiab nws yog qhov feem ntau. Kev Pabcuam Zoo (QoS) cov yam ntxwv ntawm lub tsev thiab kev lag luam tes hauj lwm yog tsim los tswj cov bandwidth thiab latency los muab kev ua tau zoo sib xws.
