{"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-le on rakendatud seadistus, mis h\u00f5lmab TCP_NODELAY re\u017eiimi kogu s\u00fcsteemi jaoks","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Job Snijders, tunnustatud OpenBSD arendaja, IETF (Internet Engineering Task Force) \u00fche komitee juht, 11 RFC autori, mis on seotud marsruutimise ja RPKI-ga, ning IRRd (Internet Routing Registry Daemon) looja, avaldas OpenBSD jaoks hulga pat\u0161i, mis lisab uue sysctl-parameetri \"net.inet.tcp.nodelay\" s\u00fcsteemi tasemel Nagle'i algoritmi keelamiseks. See parameeter vabastab rakenduste arendajad TCP_NODELAY lipu rakendamisest eraldi soketites. <\/p>\n

Nagle'i algoritmi kasutatakse v\u00e4ikeste s\u00f5numite kogumiseks, et v\u00e4hendada andmesidekoormust. Algoritm peatab uute TCP segmentide saatmise seni, kuni on saadud kinnitused varem saadetud andmete vastuv\u00f5tmiseks v\u00f5i kuni aegumist\u00e4htaeg on l\u00f5ppenud. N\u00e4iteks, ilma kogumiseta 1 baiti saatmisel saadetakse t\u00e4iendavalt 40 baiti TCP ja IP p\u00e4iseid, samas kui Nagle'i algoritmi kasutades koguneb kinnitust oodates saadetud s\u00f5numid ja saadetakse \u00fches paketis. Olemuslike optimeerimiste t\u00f5ttu, n\u00e4iteks \"delayed ACK\", mis viib ACK-pakettide saatmise edasi, ei t\u00f6\u00f6ta kinnitustega signaal tegelikult ja kogunenud s\u00f5numite saatmine toimub aegumist\u00e4htaega saabudes. <\/p>\n

Snijders on arvamusel, et t\u00e4nap\u00e4eva tingimustes on Nagle'i algoritm, mis loodi ajal, mil mitmed kasutajad v\u00f5istlesid 1200 baudil oleva ribalaiuse p\u00e4rast, ajale jalgu j\u00e4\u00e4nud ja k\u00f5rge ribalaiusega v\u00f5rkudes<\/a> on sellest rohkem kahju kui kasu. Hiljaaegu v\u00e4ljendas sarnast seisukohta ka Marc Brooker Amazon Web Servicesest (AWS). T\u00f5endid Nagle'i algoritmi vaikeseadmest eemaldamise toetuseks on kajastatud m\u00f5ni p\u00e4ev tagasi avaldatud artiklis. <\/p>\n

Nagle'i algoritmi eemaldamiseks on ette n\u00e4htud TCP_NODELAY valik, mida saab seada eraldi v\u00f5rgu soketitele. TCP_NODELAY re\u017eiimi on juba pikka aega kasutatud paljudes OpenBSD rakendustes, sealhulgas openssh, httpd, iscsid, relayd, bgpd ja unwind, ja Snijders peab \u00f5igeks v\u00f5imalust selle rakendamist k\u00f5igi TCP sokettide tasemel. Samuti soovitab Snijders arutada TCP_NODELAY vaikeseadmestamist ja Nagle'i algoritmi muutmist eraldi aktiveeritavaks valikuks.
\n
Allikas: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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