{"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\/sv\/blog\/news\/dlya-openbsd-realizovana-nastrojka-vklyuchayushhaya-rezhim-tcp_nodelay-dlya-vsej-sistemy","title":{"rendered":"F\u00f6r OpenBSD har en konfiguration implementerats som inkluderar TCP_NODELAY-l\u00e4get f\u00f6r hela systemet","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Job Snijders, en framst\u00e5ende OpenBSD-utvecklare, ledare f\u00f6r en av kommitt\u00e9erna inom IETF (Internet Engineering Task Force), f\u00f6rfattare av 11 RFC:er relaterade till routing och RPKI, samt skaparen av IRRd (Internet Routing Registry Daemon), har publicerat ett antal patchar f\u00f6r OpenBSD som l\u00e4gger till den nya sysctl-parametern 'net.inet.tcp.nodelay' f\u00f6r att inaktivera Nagle-algoritmen p\u00e5 systemniv\u00e5. Denna parameter befriar applikationsutvecklare fr\u00e5n att beh\u00f6va s\u00e4tta TCP_NODELAY-flaggor f\u00f6r individuella sockets. <\/p>\n

Nagle-algoritmen anv\u00e4nds f\u00f6r att sammansl\u00e5 sm\u00e5 meddelanden f\u00f6r att minska trafiken. Algoritmen avbryter skickandet av nya TCP-segment tills en bekr\u00e4ftelse p\u00e5 mottagna data har erh\u00e5llits eller en timeout intr\u00e4ffar. Till exempel, utan att anv\u00e4nda aggregering, n\u00e4r 1 byte skickas, skickas ytterligare 40 byte med TCP- och IP-headerna, medan med Nagle-algoritmen ackumuleras meddelanden som skickats innan bekr\u00e4ftelsen fr\u00e5n den avl\u00e4gsna parten kommer och skickas i ett enda paket. P\u00e5 grund av optimeringen 'delayed ACK', som f\u00f6rdr\u00f6jer skickandet av ACK-paket, fungerar signaleringen genom bekr\u00e4ftelsepaket i sj\u00e4lva verket inte, och skickandet av ackumulerade meddelanden utf\u00f6rs vid timeout. <\/p>\n

Snijders anser att Nagle-algoritmen, som utvecklades i en tid d\u00e5 flera anv\u00e4ndare t\u00e4vlade om en \u00f6verf\u00f6ringskapacitet p\u00e5 1200 baud, \u00e4r f\u00f6r\u00e5ldrad i h\u00f6ghastighetsn\u00e4tverk<\/a> och att den g\u00f6r mer skada \u00e4n nytta. Nyligen har ocks\u00e5 Marc Brooker fr\u00e5n Amazon Web Services (AWS) uttryckt en liknande \u00e5sikt. Argument f\u00f6r att inaktivera Nagle-algoritmen som standard kan l\u00e4sas i en artikel som publicerades f\u00f6r n\u00e5gra dagar sedan. <\/p>\n

F\u00f6r att inaktivera Nagle-algoritmen finns det en TCP_NODELAY-alternativ som kan st\u00e4llas in f\u00f6r enskilda n\u00e4tverks sockets. TCP_NODELAY-l\u00e4get har l\u00e4nge st\u00e4llts in i m\u00e5nga OpenBSD-applikationer, bland dem openssh, httpd, iscsid, relayd, bgpd och unwind, och enligt Snijders \u00e4r det dags att ge m\u00f6jlighet att aktivera det f\u00f6r alla TCP-sockets p\u00e5 systemniv\u00e5. Snijders f\u00f6resl\u00e5r ocks\u00e5 att diskutera fr\u00e5gan om att aktivera TCP_NODELAY som standard och att klassa Nagle-algoritmen som ett alternativ som kan aktiveras.
\n
K\u00e4lla: 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 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