{"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\/it\/blog\/news\/dlya-openbsd-realizovana-nastrojka-vklyuchayushhaya-rezhim-tcp_nodelay-dlya-vsej-sistemy","title":{"rendered":"Per OpenBSD \u00e8 stata implementata una configurazione che abilita la modalit\u00e0 TCP_NODELAY per l'intero sistema","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Job Snijders, noto sviluppatore di OpenBSD, presidente di uno dei comitati dell'IETF (Internet Engineering Task Force), autore di 11 RFC relativi al routing e RPKI, e creatore di IRRd (Internet Routing Registry Daemon), ha pubblicato un insieme di patch per OpenBSD che aggiungono un nuovo parametro sysctl \"net.inet.tcp.nodelay\" per disabilitare l'algoritmo di Nagle a livello di sistema. Questo parametro solleva gli sviluppatori di applicazioni dall'obbligo di impostare il flag TCP_NODELAY per singoli socket.    <\/p>\n<p>L'algoritmo di Nagle \u00e8 utilizzato per aggregare piccoli messaggi al fine di ridurre il traffico. L'algoritmo sospende l'invio di nuovi segmenti TCP fino alla ricezione di conferma di ricezione dei dati precedentemente inviati o fino al verificarsi di un timeout. Ad esempio, senza utilizzare l'aggregazione, l'invio di 1 byte comporta l'invio di ulteriori 40 byte con le intestazioni pacchetti TCP e IP, mentre con l'applicazione dell'algoritmo di Nagle \u2014 i messaggi inviati prima della ricezione della conferma da parte remota vengono accumulati e inviati in un unico pacchetto. A causa dell'ottimizzazione \"delayed ACK\", che ritarda l'invio dei pacchetti ACK, il segnale attraverso i pacchetti di conferma in realt\u00e0 non funziona e l'invio dei messaggi accumulati avviene al verificarsi del timeout.    <\/p>\n<p>Snijders ritiene che, nelle attuali realt\u00e0, l'algoritmo di Nagle, sviluppato in un'epoca in cui diversi utenti competevano per una larghezza di banda di 1200 baud, sia obsoleto e <a href=\"https:\/\/prohoster.info\/it\/server\/dts-sofia\/\"  data-wpil-monitor-id=\"3251\">nelle reti ad alta velocit\u00e0<\/a> porti pi\u00f9 danni che benefici. Recentemente, anche Marc Brooker di Amazon Web Services (AWS) ha espresso una posizione simile. I motivi a favore della disabilitazione dell'algoritmo di Nagle per impostazione predefinita possono essere trovati in un articolo pubblicato pochi giorni fa.       <\/p>\n<p>Per disabilitare l'algoritmo di Nagle esiste l'opzione TCP_NODELAY, che pu\u00f2 essere impostata per singoli socket di rete. La modalit\u00e0 TCP_NODELAY \u00e8 stata a lungo attivata in molte applicazioni di OpenBSD, tra cui openssh, httpd, iscsid, relayd, bgpd e unwind, e, secondo Snijders, \u00e8 giunto il momento di fornire la possibilit\u00e0 di attivarla per tutti i socket TCP a livello di sistema. Snijders propone anche di discutere l'opzione di attivare TCP_NODELAY per impostazione predefinita e di considerare l'algoritmo di Nagle come un'opzione separata attivabile.<br \/>\n<br \/>Fonte: <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 5.0.1.1 - 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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