{"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\/ro\/blog\/news\/dlya-openbsd-realizovana-nastrojka-vklyuchayushhaya-rezhim-tcp_nodelay-dlya-vsej-sistemy","title":{"rendered":"Pentru OpenBSD a fost implementat\u0103 o configurare care include modul TCP_NODELAY pentru \u00eentreaga sistem.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Job Snijders, un cunoscut dezvoltator OpenBSD, lider al uneia dintre comitetele IETF (Internet Engineering Task Force), autor al 11 RFC-uri legate de rutare \u0219i RPKI, \u0219i creator al IRRd (Internet Routing Registry Daemon), a publicat un set de patch-uri pentru OpenBSD care adaug\u0103 un nou parametru sysctl, \u201enet.inet.tcp.nodelay\u201d, pentru dezactivarea algoritmului Nagle la nivelul \u00eentregului sistem. Acest parametru scute\u0219te dezvoltatorii de aplica\u021bii de la setarea flag-ului TCP_NODELAY pentru socket-uri individuale. <\/p>\n

Algoritmul Nagle este folosit pentru agregarea unor mesaje mici cu scopul de a reduce traficul. Algoritmul suspend\u0103 trimiterea de noi segmente TCP p\u00e2n\u0103 la primirea unei confirm\u0103ri de recep\u021bie a datelor trimise anterior sau p\u00e2n\u0103 la expirarea unui timeout. De exemplu, f\u0103r\u0103 aplicarea agreg\u0103rii, la trimiterea a 1 byte, se mai trimit 40 de byte cu antetele pachetului TCP \u0219i IP, iar cu aplicarea algoritmului Nagle \u2014 mesajele trimise p\u00e2n\u0103 la sosirea confirm\u0103rii din partea p\u0103r\u021bii remote se acumuleaz\u0103 \u0219i sunt trimise \u00eentr-un singur pachet. Datorit\u0103 optimiz\u0103rii \u201edelayed ACK\u201d, care \u00eent\u00e2rzie trimiterea pachetelor ACK, semnalul prin pachetele cu confirmare nu func\u021bioneaz\u0103 \u00een realitate, iar trimiterea mesajelor acumulate se efectueaz\u0103 la expirarea timeout-ului. <\/p>\n

Snijders este de p\u0103rere c\u0103, \u00een realit\u0103\u021bile moderne, algoritmul Nagle, dezvoltat \u00een vremurile c\u00e2nd mai mul\u021bi utilizatori concurau pentru o l\u0103\u021bime de band\u0103 de 1200 baud, este dep\u0103\u0219it \u0219i \u00een re\u021belele de mare vitez\u0103<\/a> este mai d\u0103un\u0103tor dec\u00e2t util. Recent, o pozi\u021bie similar\u0103 a fost exprimat\u0103 \u0219i de Marc Brooker de la Amazon Web Services (AWS). Argumentele \u00een favoarea dezactiv\u0103rii algoritmului Nagle \u00een mod implicit pot fi g\u0103site \u00eentr-un articol publicat acum c\u00e2teva zile. <\/p>\n

Pentru dezactivarea algoritmului Nagle exist\u0103 op\u021biunea TCP_NODELAY, care poate fi setat\u0103 pentru socket-uri de re\u021bea individuale. Modul TCP_NODELAY a fost utilizat de mult timp \u00een multe aplica\u021bii OpenBSD, printre care openssh, httpd, iscsid, relayd, bgpd \u0219i unwind, iar, \u00een opinia lui Snijders, a sosit momentul s\u0103 se ofere posibilitatea activ\u0103rii acestuia pentru toate socket-urile TCP la nivel de sistem. Snijders sugereaz\u0103, de asemenea, discutarea activ\u0103rii TCP_NODELAY \u00een mod implicit \u0219i mutarea algoritmului Nagle \u00een categoria op\u021biunilor discrete disponibile.
\n
Sursa: opennet.ro<\/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\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\udd47Pentru OpenBSD a fost implementat\u0103 o configurare care include modul TCP_NODELAY pentru \u00eentreaga sistem | ProHoster","description":"Job Snijders, un dezvoltator de renume OpenBSD, lider al uneia dintre comisiile IETF (Internet Engineering Task Force), autor a 11 RFC-uri legate de rutare \u0219i RPKI, \u0219i creator al IRRd 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