Qhov Cuam Tshuam ntawm Latency hauv Networks
Pendahuluuan
Kev qeeb qeeb ntawm lub network yog ib qho uas feem ntau tsis quav ntsej txog kev ua haujlwm ntawm lub network thiab internet. Txawm hais tias bandwidth lossis download speed li cas los xij, kev qeeb qeeb tuaj yeem cuam tshuam rau qhov zoo ntawm kev paub ntawm tus neeg siv, tshwj xeeb tshaj yog thaum nws los txog rau cov ntawv thov uas xav tau lub sijhawm teb sai, xws li kev ua si online, video streaming, thiab kev sib tham video. Tsab xov xwm no yuav tham txog kev qeeb qeeb yog dab tsi, vim li cas nws thiaj tseem ceeb, cov yam uas cuam tshuam rau nws, thiab yuav ua li cas kom txo qis kev qeeb qeeb ntawm lub network.
Latency yog dab tsi?
Latency, hauv cov ntsiab lus ntawm kev sib txuas lus, yog lub sijhawm uas nws siv rau cov ntaub ntawv mus los ntawm ib qho chaw mus rau lwm qhov. Latency feem ntau ntsuas hauv milliseconds (ms) vim tias kev txav mus los ntawm cov ntaub ntawv hauv lub network feem ntau yog ceev heev. Muaj ntau hom latency feem ntau ntsuas, suav nrog:
1. Ib txoj kev latency: Lub sijhawm xav tau rau cov ntaub ntawv mus los ntawm tus xa mus rau tus txais.
2. Lub sijhawm rov qab mus los: Lub sijhawm tag nrho uas xav tau rau cov ntaub ntawv mus los ntawm tus xa mus rau tus txais thiab rov qab mus rau tus xa.
Latency yog ib qho ntawm peb qhov ntsuas tseem ceeb uas siv los ntsuas kev ua haujlwm ntawm lub network, nrog rau kev xa tawm thiab kev poob pob ntawv.
Vim li cas Latency thiaj tseem ceeb?
Qhov qeeb qeeb yog qhov tseem ceeb vim tias nws tuaj yeem cuam tshuam rau kev paub ntawm tus neeg siv thoob plaws ntau yam kev siv thiab kev pabcuam. Qee qhov cuam tshuam pom tseeb tshaj plaws ntawm qhov qeeb qeeb siab suav nrog:
1. Kev Paub Txog Kev Ua Si Hauv Online
Hauv kev ua si online, tshwj xeeb yog thawj tus neeg tua phom (FPS) lossis kev ua si tiag tiag (RTS), latency siab tuaj yeem ua rau "lag," qhov twg cov kev ua ntawm tus neeg ua si qeeb hauv kev ua tiav. Qhov no tsis yog tsuas yog tsim kev ua si tsis txaus siab xwb tab sis kuj tuaj yeem ua rau cov neeg ua si hauv kev sib tw tsis zoo.
2. Kev Tshaj Tawm Video thiab Kev Sib Tham Video
Kev qeeb qeeb heev yuav ua rau muaj kev ncua lossis qeeb thaum streaming video. Hauv kev sib tham video, kev qeeb qeeb heev yuav ua rau muaj kev ncua suab thiab video, cuam tshuam kev sib txuas lus thiab kev koom tes ntawm cov neeg koom.
3. Cov Ntawv Thov Hauv Huab
Cov ntawv thov siv huab xws li Google Docs lossis cov kev pabcuam khaws cia cov ntaub ntawv online vam khom rau cov lus teb ceev ntawm lub server. Kev latency siab tuaj yeem ua rau lub sijhawm thauj khoom qeeb, txo qis kev tsim khoom thiab kev ua haujlwm zoo.
Cov Yam Cuam Tshuam Rau Latency
Muaj ntau yam uas yuav cuam tshuam rau latency hauv lub network, xws li:
1. Kev Nyob Deb Ntawm Lub Cev
Cov ntaub ntawv yuav tsum taug kev hla lub cev xws li lub xov hlau fiber optic lossis satellite. Qhov deb ntawm tus xa thiab tus txais ntau npaum li cas, qhov latency ntau npaum li ntawd.
2. Tus naj npawb ntawm Hops
Tus naj npawb ntawm cov khoom siv network (xws li routers thiab switches) uas cov ntaub ntawv hla dhau tuaj yeem cuam tshuam rau latency. Txhua hop ntxiv me ntsis ntawm lub sijhawm ua tiav, yog li ntawd ntau hops, qhov latency siab dua.
3. Kev sib txuas lus tsis tu ncua
Kev sib tsoo ntawm cov tsheb khiav hauv network tuaj yeem ua rau lub sijhawm ntev dua rau cov ntaub ntawv kom mus txog nws qhov chaw vim tias cov ntaub ntawv yuav tsum tau teeb tsa kom ua tiav.
4. Kev Ua Haujlwm ntawm Cov Khoom Siv Network
Lub peev xwm thiab kev ua haujlwm zoo ntawm cov khoom siv hauv network, xws li routers, switches, thiab servers, kuj ua lub luag haujlwm tseem ceeb hauv kev txiav txim siab latency. Cov khoom siv ceev dua thiab ua haujlwm tau zoo dua tuaj yeem txo lub sijhawm ua cov ntaub ntawv.
5. Cov Txheej Txheem Network thiab Kev Teeb tsa
Cov txheej txheem network xws li TCP/IP ua haujlwm hauv ib txoj kev tshwj xeeb uas tuaj yeem ntxiv me ntsis ntawm latency vim lawv cov kev xav tau kev lees paub thiab kev sib dhos. Tsis tas li ntawd, kev teeb tsa tsis zoo, xws li kev teeb tsa DNS qeeb, kuj tseem tuaj yeem ua rau latency ntau ntxiv.
Yuav Ua Li Cas Txo Qhov Latency
Muaj ntau txoj hauv kev los txo qhov latency hauv lub network, suav nrog:
1. Kev Txhim Kho Txoj Kev Network
Kev txo cov naj npawb ntawm cov ntaub ntawv hops uas yuav tsum tau mus ncig yuav pab txo qhov latency. Qhov no tuaj yeem ua tiav los ntawm kev xaiv cov kev luv dua lossis siv cov thev naus laus zis xws li MPLS (Multi-Protocol Label Switching) rau kev xa xov zoo dua.
2. Txhim Kho Cov Khoom Siv Network
Siv cov routers, switches, thiab servers uas siab dua thiab ceev dua tuaj yeem pab txo lub sijhawm ua cov ntaub ntawv ntawm txhua qhov hop.
3. Siv CDN (Content Delivery Network)
Ib lub CDN tuaj yeem faib cov ntawv theej ntawm cov ntaub ntawv mus rau ntau lub servers hauv ntau qhov chaw sib txawv, yog li cov ntaub ntawv tuaj yeem nkag mus tau los ntawm lub server ze tshaj plaws rau tus neeg siv kom txo qis latency.
4. Kev Siv Bandwidth Ntau Ntxiv
Txawm hais tias kev nce bandwidth tsis ncaj qha txo qhov latency, nws tuaj yeem txo qhov kev sib tsoo ntawm lub network, uas yog ib qho ntawm cov yam ua rau muaj latency siab.
5. Kev Xaiv Cov Txheej Txheem Sai Dua
Cov txheej txheem xws li HTTP/2 lossis QUIC (Quick UDP Internet Connections) tuaj yeem pab txo qhov latency piv rau cov txheej txheem ib txwm muaj xws li HTTP/1.1.
Kev Kawm Txog Cov Ntaub Ntawv: Kev Siv Hauv Kev Lag Luam
1. Kev Ua Si
Ntau lub tuam txhab kev ua si xws li Blizzard thiab Riot Games siv cov servers hauv cheeb tsam thiab kev txhim kho kev sib txuas lus hauv network kom ntseeg tau tias cov neeg ua si tau txais qhov latency qis tshaj plaws.
2. Cov Ntsiab Lus Tshaj Tawm
Cov platforms zoo li Netflix thiab YouTube siv CDNs los xyuas kom meej tias cov ntsiab lus nkag mus los ntawm cov servers ze tshaj plaws rau tus neeg siv, txo qhov buffering thiab txhim kho qhov zoo ntawm streaming.
3. Cov Kev Pabcuam Huab
Cov tuam txhab xws li Google thiab Microsoft siv cov tes hauj lwm fiber optic ntiag tug thiab ntau yam thev naus laus zis los txhim kho network kom txo qhov latency thiab ua kom muaj kev teb sai dua ntawm cov ntawv thov huab.
Xaus
Qhov qeeb qeeb yog ib qho tseem ceeb uas cuam tshuam rau qhov zoo ntawm kev pabcuam thiab kev paub ntawm cov neeg siv hauv ntau yam kev siv network. Los ntawm kev ua kom zoo dua cov kev khiav haujlwm hauv network, txhim kho cov khoom siv kho vajtse, thiab siv cov CDN thiab cov txheej txheem ua haujlwm zoo dua, qhov qeeb qeeb tuaj yeem txo qis kom muab kev paub zoo dua rau cov neeg siv. Kev nkag siab thiab kev tswj hwm qhov qeeb qeeb yog qhov tseem ceeb rau cov neeg muab kev pabcuam thiab cov neeg siv kom ntseeg tau tias kev ua haujlwm ntawm network ua tau raws li cov qauv xav tau.
