{"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\/et\/blog\/news\/dlya-openbsd-realizovana-nastrojka-vklyuchayushhaya-rezhim-tcp_nodelay-dlya-vsej-sistemy","title":{"rendered":"OpenBSD jaoks on rakendatud seade, mis lubab TCP_NODELAY re\u017eiimi kogu s\u00fcsteemi ulatuses","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Job Snijders, tuntud OpenBSD arendaja, IETF (Internet Engineering Task Force) \u00fche komitee juht ja 11 RPKI ja marsruutimisega seotud RFC autori, on avaldanud komplekti pat\u0161e OpenBSD-le, mis lisab uue sysctl-parameetri \u201enet.inet.tcp.nodelay\u201d, et v\u00e4lja l\u00fclitada Nagle algoritm kogu s\u00fcsteemi tasandil. Parameeter vabastab arendajad rakendustes TCP_NODELAY flagi seadmise kohustusest eraldi socket'ite jaoks. <\/p>\n

Nagle algoritm kasutatakse v\u00e4ikeste s\u00f5numite koondamiseks, et v\u00e4hendada liiklust. Algoritm peatab uute TCP segmentide saatmise, kuni on saadud kinnitust eelnevalt saadetud andmete vastuv\u00f5tmise kohta v\u00f5i kuni ajavahemiku l\u00f5puni. N\u00e4iteks, kui 1 bait saadetakse ilma koondamiseta, saadetakse 40 baidi v\u00f5rra rohkem TCP ja IP p\u00e4isega paketti, kuid Nagle algoritmi kasutamisel kogutakse s\u00f5numid, mis saadeti enne kinnituspaketi saabumist kaugelt, ja saadetakse \u00fches pakendis. Optimiseerimise t\u00f5ttu \u201edelayed ACK\u201d, mis viib kinnituste edasil\u00fckkimist, ei toimi kinnituspakettide kaudu signaal tegelikult ja kogutud s\u00f5numite saatmine toimub ajavahemiku l\u00f5ppedes. <\/p>\n

Snijders arvab, et t\u00e4nap\u00e4eva olukordades on Nagle algoritm, mis loodi ajal, mil mitu kasutajat konkureerisid 1200 bitti\/s ribalaiuse p\u00e4rast, aegunud ning k\u00f5rge ribalaiusega v\u00f5rkudes<\/a> on sellest rohkem kahju kui kasu. Hiljuti v\u00e4ljendas sarnast seisukohta Marc Brooker Amazon Web Services (AWS) ettev\u00f5ttest. Argumentidega Nagle algoritmi vaikimisi keelamise kasuks saab tutvuda paar p\u00e4eva tagasi avaldatud m\u00e4rkuses. <\/p>\n

Nagle algoritmi keelamiseks on olemas TCP_NODELAY valik, mida saab seadistada \u00fcksikute v\u00f5rgu sokettide jaoks. TCP_NODELAY re\u017eiimi on juba pikka aega rakendatud paljudes OpenBSD rakendustes, sealhulgas openssh, httpd, iscsid, relayd, bgpd ja unwind, ning Snijdersi arvates on aeg anda v\u00f5imalus selle aktiveerimiseks k\u00f5igis TCP sokettides kogu s\u00fcsteemi tasandil. Snijders kutsub ka \u00fcles arutama TCP_NODELAY vaikimisi lubamist ja Nagle algoritmi eraldi sisse l\u00fclitatava valikuna muutmist.
\n
Allikas: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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