{"id":34,"date":"2017-08-22T20:03:01","date_gmt":"2017-08-22T18:03:01","guid":{"rendered":"https:\/\/blog.nav.ro\/?p=34"},"modified":"2019-02-22T14:07:23","modified_gmt":"2019-02-22T12:07:23","slug":"cum-accelereaza-google-internetul","status":"publish","type":"post","link":"https:\/\/www.nav.ro\/blog\/cum-accelereaza-google-internetul\/","title":{"rendered":"Cum accelereaz\u0103 Google Internetul"},"content":{"rendered":"<p>Google a dezvoltat un algoritm care accelereaz\u0103 TCP\/IP, protocolul de transmisie primar\u0103 a internetului, cu p\u00e2n\u0103 la 14%<\/p>\n<p>Inginerii de la Google au dezvoltat un nou algoritm pentru accelerarea TCP, principalul protocol de transport pentru traficul de internet, optimiz\u00e2nd viteza cu care este transmis traficul, astfel \u00eenc\u00e2t s\u0103 nu blocheze rutele disponibile.<\/p>\n<p>Ace\u015ftia sus\u0163in c\u0103 metoda lor de accelerare, denumit\u0103 timp de propagare a l\u0103\u0163imii de band\u0103 \u015fi a vitezei de \u00eentoarcere (BBR &#8211; bottleneck bandwidth and roundtrip), calculeaz\u0103 care este cea mai rapid\u0103 modalitate de a trimite date pe diferite rute \u015fi este capabil\u0103 s\u0103 gestioneze mai eficient traficul atunci c\u00e2nd rutele de date devin aglomerate. Google deja utilizeaz\u0103 BBR pentru a accelera traficul pe YouTube, iar luna trecut\u0103 compania a f\u0103cut BBR disponibil\u0103 \u015fi pe platforma Google Cloud. Google spune c\u0103 implementarea BBR a gr\u0103bit traficul deja optimizat pentru YouTube cu 4% \u00een medie \u015fi cu 14% \u00een unele \u0163\u0103ri.<\/p>\n<p><strong>Eforturi de acelerare TCP<\/strong><\/p>\n<p>TCP s-a dezvoltat \u00een anii 1970 ca parte a suitei de protocoale TCP\/IP pentru a transforma datele \u00een pachete pentru transmisie c\u0103tre internet. Cercet\u0103torii de la Internet Engineering Task Force (IETF) estimeaz\u0103 c\u0103 peste 90% din traficul IP este transmis prin TCP.<\/p>\n<p>\u00cen ultimele decenii s-au depus eforturi multiple pentru accelerarea TCP\/IP, multe dintre ele concentradu-se asupra modului \u00een care TCP se ocup\u0103 de congestionare. TCP a fost proiectat pentru a controla debitul de trafic atunci c\u00e2nd apare congestionarea, acest lucru fiind posibil prin monitorizarea num\u0103rului de pachete pierdute \u00een timpul transportului.<\/p>\n<p>&#8222;Acest lucru a func\u0163ionat bine pentru mul\u0163i ani deoarece buffer-ele mici ale switch-ruilor \u015fi ale router-elor au fost bine adaptate la l\u0103\u0163imea de band\u0103 redus\u0103 a leg\u0103turilor de internet&#8221;, a explicat Google \u00eentr-un articol pe blog, articol menit s\u0103 anun\u0163e proiectul BBR. Dar a\u015fa-numitul control al congestion\u0103rii &#8222;bazat pe pierderi&#8221; nu func\u0163ioneaz\u0103 la fel de bine \u00een mediile de ast\u0103zi.<\/p>\n<p>Van Jacobson, unul dintre creatorii TCP \u015fi totodat\u0103 unul dintre inginerii care au developat BBR, spune c\u0103 dac\u0103 TCP \u00eencetine\u015fte traficul doar atunci c\u00e2nd detecteaz\u0103 pierderea de pachete, atunci este prea t\u00e2rziu.<\/p>\n<p>&#8222;(BBR) nu a\u015fteapt\u0103 s\u0103 apar\u0103 o pierdere&#8221;, spune Jacobson. &#8222;Este despre &#8222;modelarea \u0163evii&#8221; ca \u015fi cum ar avea lungime \u015fi diametru pentru a determina c\u00e2te date pot \u00eenc\u0103pea \u00een ea&#8221;.<\/p>\n<p><strong>Standarde<\/strong><\/p>\n<p>BBR evalueaz\u0103 \u00een mod constant cantitatea de trafic dus-\u00eentors pe mai multe rute, astfel \u015ftie c\u00e2t timp le va lua datelor s\u0103 traverseze re\u0163eaua pentru rata de vitez\u0103 cu care sunt trimise. Proced\u00e2nd astfel, BBR va trimite traficul la o vitez\u0103 pe care o poate gestiona re\u0163eaua. Acest lucru este mai eficient dec\u00e2t controlul original TCP al congestiei.<\/p>\n<p>BBR este de asemenea compatibil cu un protocol alternativ de transport, conexiuni rapide de internet UDP (QUIC), concepute de Google \u015fi propuse pentru standardizare c\u0103tre IETF.<\/p>\n<p>BBR nu este primul efort de a accelera TCP. Cercet\u0103torii de la Universitatea de Stat din Carolina de Nord sunt cunoscu\u0163i pentru dezvoltarea unuora dintre cei mai cunoscu\u0163i algoritmi de control al congestiei bazate pe pierderi utilizate ast\u0103zi \u00een TCP, numit controlul congestiei binare (BIC) \u015fi, ulterior, (CUBIC). La nivel \u00eenalt, acestea \u00eenregistreaz\u0103, de asemenea, m\u0103sur\u0103torile pentru estimarea vitezei optime cu care s\u0103 trimit\u0103 datele atunci c\u00e2nd este detectat\u0103 congestia. Un alt algoritm care a devenit popular este numit Reno.<\/p>\n<p>Toate acestea folosesc pierderi de pachete pentru a determina congestia, de\u015fi Jacobson, inginerul Google care a dezvoltat BBR, spune c\u0103, \u00een cuno\u015ftin\u0163ele sale, BBR este singurul algoritm TCP care estimeaz\u0103 viteza traficului pentru a determina cel mai bun mod de trimitere, indiferent dac\u0103 pachetele au fost pierdute.<\/p>\n<p><strong>Reac\u0163ia la BBR<\/strong><\/p>\n<p>Mirja K\u00fchlewind este cercet\u0103tor principal la Networked Systems Group din Zurich \u015fi mai este \u015fi Transport Area Director la IETF unde lucreaz\u0103 la \u00eentre\u0163inerea \u015fi \u00eembun\u0103t\u0103\u0163irea TCP. Ea sus\u0163ine c\u0103, crearea de standarde \u00een domeniul transportului \u015fi controlului gestion\u0103rii dureaz\u0103 de mult timp. Dintre zeci de \u00eencerc\u0103ri de \u00eembun\u0103t\u0103\u0163ire a TCP a a existat doar una ce a fost standardizat\u0103 \u015fi aceasta a fost \u00eenainte de dezvoltarea BIC \u015fi BBR.<\/p>\n<p>&#8222;\u00cen general standardizarea schemelor de control al congestiei nu este un subiect u\u015for. Dac\u0103 o companie ar putea impune un standard, aceasta ar putea fi Google av\u00e2nd \u00een vedere nivelul la care opereaz\u0103&#8221;, a declarat ea.<\/p>\n<p>Jacobson afirm\u0103 c\u0103 obiectivul companiei este ca BBR s\u0103 devin\u0103 un standard.<\/p>\n<p>K\u00fchlewind spune c\u0103 BBR promite mult. &#8222;At\u00e2t Reno, c\u00e2t \u015fi CUBIC lucreaz\u0103 pe acela\u015fi principiu \u015fi reac\u0163ioneaz\u0103 la pierderea pachetelor ca semn al congestiei, reducnad rata de expediere \u00een cazul detect\u0103rii de pierderi&#8221;. Cu toate acestea, BBR utilizeaz\u0103 informa\u0163iile de sincronizare a pachetelor pentru a deduce dac\u0103 leg\u0103tura este congestionat\u0103.<\/p>\n<p>Unii clien\u0163i Google observ\u0103 deja beneficiile BBR. WordPress g\u0103zduie\u015fte jum\u0103tate de milion de site-uri \u00een Google Cloud, iar fondatorul \u015fi CTO-ul Jason Cohen a citat o estimare Google care arat\u0103 c\u0103 BBR ofer\u0103 o \u00eembun\u0103t\u0103\u0163ire a performan\u0163elor de 2700x comparativ cu alte controale de congestie bazate pe pierderi.<\/p>\n<p>Utilizatorii platformei Google Cloud vor beneficia automat de avantajele BBR atunci c\u00e2nd utilizeaz\u0103 anumite servicii cloud GCP, inclusiv Cloud Spanner, BigTable, Storage, CDN \u0219i Load Balancing, f\u0103r\u0103 costuri suplimentare.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Google a dezvoltat un algoritm care accelereaz\u0103 TCP\/IP, protocolul de transmisie primar\u0103 a internetului, cu p\u00e2n\u0103 la 14% Inginerii de la Google au dezvoltat un nou algoritm pentru accelerarea TCP, principalul protocol de transport pentru traficul de internet, optimiz\u00e2nd viteza cu care este transmis traficul, astfel \u00eenc\u00e2t s\u0103 nu blocheze rutele disponibile. Ace\u015ftia sus\u0163in c\u0103<\/p>\n","protected":false},"author":1,"featured_media":1278,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[148],"tags":[130,133,125],"class_list":["post-34","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-servere","tag-network","tag-tcpip","tag-viteza-de-internet"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Cum accelereaz\u0103 Google Internetul - NAV.RO Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.nav.ro\/blog\/cum-accelereaza-google-internetul\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cum accelereaz\u0103 Google Internetul - NAV.RO Blog\" \/>\n<meta property=\"og:description\" content=\"Google a dezvoltat un algoritm care accelereaz\u0103 TCP\/IP, protocolul de transmisie primar\u0103 a internetului, cu p\u00e2n\u0103 la 14% Inginerii de la Google au dezvoltat un nou algoritm pentru accelerarea TCP, principalul protocol de transport pentru traficul de internet, optimiz\u00e2nd viteza cu care este transmis traficul, astfel \u00eenc\u00e2t s\u0103 nu blocheze rutele disponibile. 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