{"id":115792,"date":"2024-05-15T08:59:29","date_gmt":"2024-05-15T06:59:29","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/dlya-openbsd-realizovana-nastrojka-vklyuchayushhaya-rezhim-tcp_nodelay-dlya-vsej-sistemy"},"modified":"2026-02-14T13:19:52","modified_gmt":"2026-02-14T11:19:52","slug":"dlya-openbsd-realizovana-nastrojka-vklyuchayushhaya-rezhim-tcp_nodelay-dlya-vsej-sistemy","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pl\/blog\/news\/dlya-openbsd-realizovana-nastrojka-vklyuchayushhaya-rezhim-tcp_nodelay-dlya-vsej-sistemy","title":{"rendered":"W OpenBSD wprowadzono ustawienie, kt\u00f3re w\u0142\u0105cza tryb TCP_NODELAY dla ca\u0142ego systemu","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Job Snijders, uznawany programista OpenBSD, przewodnicz\u0105cy jednego z komitet\u00f3w w IETF (Internet Engineering Task Force), autor 11 RFC zwi\u0105zanych z routowaniem i RPKI oraz tw\u00f3rca IRRd (Internet Routing Registry Daemon), opublikowa\u0142 zestaw poprawek dla OpenBSD, kt\u00f3re dodaj\u0105 nowy parametr sysctl &#171;net.inet.tcp.nodelay&#187; do wy\u0142\u0105czenia algorytmu Nagle'a na poziomie ca\u0142ego systemu. Parametr ten zwalnia programist\u00f3w aplikacji z konieczno\u015bci ustawiania flagi TCP_NODELAY dla poszczeg\u00f3lnych gniazd.    <\/p>\n<p>Algorytm Nagle'a jest wykorzystywany do agregowania ma\u0142ych wiadomo\u015bci w celu zmniejszenia ruchu. Algorytm wstrzymuje wysy\u0142anie nowych segment\u00f3w TCP do momentu otrzymania potwierdzenia odbioru wcze\u015bniej wys\u0142anych danych lub do wyga\u015bni\u0119cia timera. Na przyk\u0142ad, bez zastosowania agregacji przy wysy\u0142aniu 1 bajta, dodatkowo wysy\u0142ane jest 40 bajt\u00f3w z nag\u0142\u00f3wkami pakiet\u00f3w TCP i IP, a z zastosowaniem algorytmu Nagle'a - wiadomo\u015bci wys\u0142ane przed przybyciem potwierdzenia od strony zdalnej s\u0105 gromadzone i wysy\u0142ane jako jeden pakiet. Z powodu optymalizacji &#171;delayed ACK&#187; op\u00f3\u017aniaj\u0105cej wysy\u0142anie pakiet\u00f3w ACK, sygna\u0142 przez pakiety z potwierdzeniem w rzeczywisto\u015bci nie dzia\u0142a, a wysy\u0142ka zgromadzonych wiadomo\u015bci nast\u0119puje po wyga\u015bni\u0119ciu timera.    <\/p>\n<p>Snijders twierdzi, \u017ce w dzisiejszych realiach algorytm Nagla, opracowany w czasach, gdy kilku u\u017cytkownik\u00f3w konkurowa\u0142o o pasmo 1200 bod\u00f3w, jest przestarza\u0142y i <a href=\"https:\/\/prohoster.info\/pl\/server\/dts-sofia\/\"  data-wpil-monitor-id=\"3251\">w sieciach wysokiej przepustowo\u015bci<\/a> przynosi wi\u0119cej szkody ni\u017c po\u017cytku. Niedawno podobne stanowisko wyrazi\u0142 Marc Brooker z firmy Amazon Web Services (AWS). Argumenty na rzecz domy\u015blnego wy\u0142\u0105czenia algorytmu Nagla mo\u017cna znale\u017a\u0107 w notatce opublikowanej kilka dni temu.       <\/p>\n<p>Aby wy\u0142\u0105czy\u0107 algorytm Nagla, przewidziano opcj\u0119 TCP_NODELAY, kt\u00f3ra mo\u017ce by\u0107 ustawiana dla poszczeg\u00f3lnych gniazd sieciowych. Tryb TCP_NODELAY jest ju\u017c od dawna stosowany w wielu aplikacjach OpenBSD, takich jak openssh, httpd, iscsid, relayd, bgpd i unwind, a zdaniem Snijdersa nadszed\u0142 czas na zapewnienie mo\u017cliwo\u015bci jego w\u0142\u0105czenia dla wszystkich gniazd TCP na poziomie ca\u0142ego systemu. Snijders proponuje r\u00f3wnie\u017c om\u00f3wi\u0107 kwesti\u0119 domy\u015blnego w\u0142\u0105czenia TCP_NODELAY oraz przekszta\u0142cenia algorytmu Nagla w osobn\u0105, opcjonaln\u0105 funkcj\u0119.<br \/>\n<br \/>\u0179r\u00f3d\u0142o: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=61176\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0414\u0436\u043e\u0431 \u0421\u043d\u0435\u0439\u0434\u0435\u0440\u0441 (Job Snijders), \u043c\u0430\u0441\u0442\u0438\u0442\u044b\u0439 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a OpenBSD, \u0440\u0443\u043a\u043e\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c \u043e\u0434\u043d\u043e\u0433\u043e \u0438\u0437 \u043a\u043e\u043c\u0438\u0442\u0435\u0442\u043e\u0432 \u0432 IETF (Internet Engineering Task Force), \u0430\u0432\u0442\u043e\u0440 11 RFC, \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u044b\u0445 \u0441 \u043c\u0430\u0440\u0448\u0440\u0443\u0442\u0438\u0437\u0430\u0446\u0438\u0435\u0439 \u0438 RPKI, \u0438 \u0441\u043e\u0437\u0434\u0430\u0442\u0435\u043b\u044c IRRd (Internet Routing Registry Daemon), \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b \u043d\u0430\u0431\u043e\u0440 \u043f\u0430\u0442\u0447\u0435\u0439 \u0434\u043b\u044f OpenBSD, \u0434\u043e\u0431\u0430\u0432\u043b\u044f\u044e\u0449\u0438\u0445 \u043d\u043e\u0432\u044b\u0439 sysctl-\u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440 &#171;net.inet.tcp.nodelay&#187; \u0434\u043b\u044f \u043e\u0442\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044f \u0430\u043b\u0433\u043e\u0440\u0438\u0442\u043c\u0430 \u041d\u0435\u0439\u0433\u043b\u0430 \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 \u0432\u0441\u0435\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b. \u041f\u0430\u0440\u0430\u043c\u0435\u0442\u0440 \u0438\u0437\u0431\u0430\u0432\u043b\u044f\u0435\u0442 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u043e\u0432 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439 \u043e\u0442 \u0432\u044b\u0441\u0442\u0430\u0432\u043b\u0435\u043d\u0438\u044f [&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-115792","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.2 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0414\u0436\u043e\u0431 \u0421\u043d\u0435\u0439\u0434\u0435\u0440\u0441 (Job Snijders), \u043c\u0430\u0441\u0442\u0438\u0442\u044b\u0439 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a OpenBSD, 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