{"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\/da\/blog\/news\/dlya-openbsd-realizovana-nastrojka-vklyuchayushhaya-rezhim-tcp_nodelay-dlya-vsej-sistemy","title":{"rendered":"For OpenBSD, a configuration has been implemented that includes the TCP_NODELAY mode for the entire system.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Job Snijders, en anerkendt OpenBSD-udvikler og leder af et udvalg i IETF (Internet Engineering Task Force), forfatter til 11 RFC'er relateret til routing og RPKI, samt skaber af IRRd (Internet Routing Registry Daemon), har offentliggjort et s\u00e6t patches til OpenBSD, der tilf\u00f8jer en ny sysctl-parameter 'net.inet.tcp.nodelay' for at deaktivere Nagle-algoritmen p\u00e5 systemniveau. Denne parameter befrier udviklere fra at skulle s\u00e6tte TCP_NODELAY-flaget for individuelle sockets. <\/p>\n

Nagle-algoritmen bruges til at aggregere sm\u00e5 beskeder for at reducere trafik. Algoritmen forsinker afsendelsen af nye TCP-segmenter, indtil der modtages en bekr\u00e6ftelse p\u00e5 modtagelsen af de tidligere sendte data, eller indtil der sker et timeout. For eksempel, uden anvendelse af aggregering, n\u00e5r 1 byte sendes, sendes der yderligere 40 bytes med TCP- og IP-overskrifterne, mens der med Nagle-algoritmen akkumuleres beskeder, der sendes f\u00f8r bekr\u00e6ftelsen fra den fjerne side, og disse sendes som en enkelt pakke. P\u00e5 grund af tilstedev\u00e6relsen af optimeringen 'delayed ACK', der forsinker afsendelsen af ACK-pakker, fungerer signalet gennem bekr\u00e6ftelse faktisk ikke, og afsendelsen af de akkumulerede beskeder udf\u00f8res ved timeouts. <\/p>\n

Snijders believes that in modern conditions, Nagle's algorithm, developed at a time when several users competed for a 1200 baud bandwidth, is outdated and in high-speed networks<\/a> does more harm than good. Recently, a similar position was also expressed by Marc Brooker from Amazon Web Services (AWS). Arguments in favor of disabling Nagle's algorithm by default can be found in a note published a few days ago. <\/p>\n

To disable Nagle's algorithm, the TCP_NODELAY option is provided, which can be set for individual network sockets. The TCP_NODELAY mode has long been set in many OpenBSD applications, including openssh, httpd, iscsid, relayd, bgpd, and unwind, and according to Snijders, it is time to provide the option to enable it for all TCP sockets at the system level. Snijders also suggests discussing the issue of enabling TCP_NODELAY by default and moving Nagle's algorithm to a separate toggleable option.
\n
Kilde: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\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 «net.inet.tcp.nodelay» \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 […]<\/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\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47For OpenBSD er der implementeret en konfiguration, der inkluderer TCP_NODELAY-indstillingen for hele systemet | ProHoster","description":"Job Snijders, en anerkendt OpenBSD-udvikler, leder en af komiteerne i IETF (Internet Engineering Task Force), forfatter til 11 RFC'er relateret til routing og RPKI, og skaber af IRRd 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