{"id":115667,"date":"2024-05-10T13:52:08","date_gmt":"2024-05-10T11:52:08","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/predlozhenie-po-vklyucheniyu-rezhima-tcp_nodelay-po-umolchaniyu"},"modified":"2024-05-10T13:52:08","modified_gmt":"2024-05-10T11:52:08","slug":"predlozhenie-po-vklyucheniyu-rezhima-tcp_nodelay-po-umolchaniyu","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/news\/predlozhenie-po-vklyucheniyu-rezhima-tcp_nodelay-po-umolchaniyu","title":{"rendered":"Pakkumine, et seada TCP_NODELAY vaikimisi sisse","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Marc Brooker, insener Amazon Web Services (AWS)ist, selgitas m\u00fc\u00fcte, mis seonduvad v\u00e4ikeste s\u00f5numite edastamise efektiivsuse suurendamisega, kui kasutatakse TCP\/IP virna vaikealgotit Nagle\u2019i. Soovitused koosnevad Nagle\u2019i algoritmi vaikimisi v\u00e4ljal\u00fclitamisest, mida saab teatud rakenduste kontekstis teha, seadistades TCP_NODELAY v\u00f5rgu sokettide jaoks, kasutades setsockopt kutset, mida on juba ammu rakendatud sellistes projektides nagu Node.js ja curl.     <\/p>\n<p>Neigle'i algoritm v\u00f5imaldab koguda v\u00e4ikeseid s\u00f5numeid, et v\u00e4hendada liiklust \u2013 peatab uute TCP segmente saatmise seni, kuni saadakse kinnitus varem saadetud andmete vastuv\u00f5tmise kohta. N\u00e4iteks ilma kogumise kasutamiseta, kui saadetakse 1 bait, saadetakse lisaks veel 40 baiti TCP ja IP paketi p\u00e4iseid. Kaasaegsetes tingimustes toob Neigle'i algoritmi kasutamine kaasa m\u00e4rgatava viibimise suurenemise, mis on vastuv\u00f5etamatu interaktiivsetele ja hajutatud rakendustele.     <\/p>\n<p>Toodud on kolm peamist p\u00f5hjendust TCP_NODELAY suvandi vaikimisi kasutamiseks, mis keelab Nagle\u2019i algoritmi:  <\/p>\n<ul>\n<li class=\"l\"> Neigle'i algoritmi \u00fchilduvuse probleem 'delayed ACK' optimeerimisega, kus ACK-vastus saadetakse mitte kohe, vaid p\u00e4rast vastusandmete saamist. Probleem seisneb selles, et Neigle'i algoritmis on ACK-paketi saabumine signaaliks kogutud andmete saatmiseks, ja kui ACK-pakett ei arriveeri, toimub saatmine aja\u00fclesande saabumisel. Seega tekib n\u00f5iaring ja ACK-pakett signaalina ei t\u00f6\u00f6ta, kuna teine osapool ei saa andmeid nende saatja poole kogunemise t\u00f5ttu, ja saatja ei saada neid enne aja\u00fclesande saabumist, kuna ei saa ACK-paketti.\n<li class=\"l\"> Neigle'i algoritmi RFC kiideti heaks 1984. aastal ja see ei ole kavandatud t\u00e4nap\u00e4evaste k\u00f5rgkiiruslike v\u00f5rgu parameetrite jaoks ning <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/et\/server\/\"   title=\"serverite\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"1546\">serverite<\/a> andmekeskustes, mis toob kaasa reageerimisprobleemide tekkimise. Taotlemise ja vastamise vahel (RTT) viibimine t\u00e4nap\u00e4evastes v\u00f5rkudes on 0,5 ms + mitu millisekundit andmevahetuse korral andmekeskuste vahel \u00fches regioonis + kuni sada millisekundit \u00fclemaailmselt saatmisel. Nende millisekundite jooksul on kaasaegne server v\u00f5imeline sooritama tohutult palju t\u00f6\u00f6d.\n<li class=\"l\"> Kaasaegsed jaotatud rakendused ei edasta enam \u00fcksikuid andmebaite, vaid v\u00e4ikeste andmete kogumine toimub reeglina rakenduse tasandil. Isegi kui kasulik andme suurus on vaid paar bait, suureneb tegelik edastatav teave tavaliselt oluliselt p\u00e4rast serialiseerimise, JSON API-sidemete ja TLS-kr\u00fcpteerimise kasutamist. 40 baidi kokkuhoid pole enam nii oluline.      <\/ul>\n<p>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=61145\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041c\u0430\u0440\u043a \u0411\u0440\u0443\u043a\u0435\u0440 (Marc Brooker), \u0438\u043d\u0436\u0435\u043d\u0435\u0440 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Amazon Web Services (AWS), \u0440\u0430\u0437\u043e\u0431\u0440\u0430\u043b \u0437\u0430\u0431\u043b\u0443\u0436\u0434\u0435\u043d\u0438\u044f, \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u044b\u0435 \u0441 \u043f\u043e\u0432\u044b\u0448\u0435\u043d\u0438\u0435\u043c \u044d\u0444\u0444\u0435\u043a\u0442\u0438\u0432\u043d\u043e\u0441\u0442\u0438 \u043f\u0435\u0440\u0435\u0434\u0430\u0447\u0438 \u043c\u0435\u043b\u043a\u0438\u0445 \u0441\u043e\u043e\u0431\u0449\u0435\u043d\u0438\u0439 \u043f\u0440\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 \u0430\u043b\u0433\u043e\u0440\u0438\u0442\u043c\u0430 \u041d\u0435\u0439\u0433\u043b\u0430, \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u043e\u0433\u043e \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u0432 TCP\/IP \u0441\u0442\u0435\u043a\u0435. \u0420\u0435\u043a\u043e\u043c\u0435\u043d\u0434\u0430\u0446\u0438\u0438 \u0441\u0432\u043e\u0434\u044f\u0442\u0441\u044f \u043a \u043e\u0442\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044e \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u0430\u043b\u0433\u043e\u0440\u0438\u0442\u043c\u0430 \u041d\u0435\u0439\u0433\u043b\u0430, \u0447\u0442\u043e \u0432 \u043a\u043e\u043d\u0442\u0435\u043a\u0441\u0442\u0435 \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u044b\u0445 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439 \u043c\u043e\u0436\u043d\u043e \u0441\u0434\u0435\u043b\u0430\u0442\u044c \u0447\u0435\u0440\u0435\u0437 \u0432\u044b\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u043e\u043f\u0446\u0438\u0438 TCP_NODELAY \u0434\u043b\u044f \u0441\u0435\u0442\u0435\u0432\u044b\u0445 \u0441\u043e\u043a\u0435\u0442\u043e\u0432 \u043f\u0440\u0438 \u043f\u043e\u043c\u043e\u0449\u0438 \u0432\u044b\u0437\u043e\u0432\u0430 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-115667","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041c\u0430\u0440\u043a \u0411\u0440\u0443\u043a\u0435\u0440 (Marc Brooker), \u0438\u043d\u0436\u0435\u043d\u0435\u0440 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Amazon Web Services (AWS), \u0440\u0430\u0437\u043e\u0431\u0440\u0430\u043b \u0437\u0430\u0431\u043b\u0443\u0436\u0434\u0435\u043d\u0438\u044f, \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u044b\u0435 \u0441 \u043f\u043e\u0432\u044b\u0448\u0435\u043d\u0438\u0435\u043c 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