{"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\/cs\/blog\/news\/dlya-openbsd-realizovana-nastrojka-vklyuchayushhaya-rezhim-tcp_nodelay-dlya-vsej-sistemy","title":{"rendered":"Pro OpenBSD byla implementov\u00e1na konfigurace, kter\u00e1 zahrnuje re\u017eim TCP_NODELAY pro cel\u00fd syst\u00e9m.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Job Snijders, renomovan\u00fd v\u00fdvoj\u00e1\u0159 OpenBSD, vedouc\u00ed jednoho z v\u00fdbor\u016f v IETF (Internet Engineering Task Force), autor 11 RFC t\u00fdkaj\u00edc\u00edch se sm\u011brov\u00e1n\u00ed a RPKI, a tv\u016frce IRRd (Internet Routing Registry Daemon), zve\u0159ejnil sadu patch\u016f pro OpenBSD, kter\u00e9 p\u0159id\u00e1vaj\u00ed nov\u00fd sysctl parametr \u201enet.inet.tcp.nodelay\u201c pro vypnut\u00ed Nagleova algoritmu na \u00farovni cel\u00e9 syst\u00e9mu. Tento parametr osvobozuje v\u00fdvoj\u00e1\u0159e aplikac\u00ed od nastavov\u00e1n\u00ed p\u0159\u00edznaku TCP_NODELAY pro jednotliv\u00e9 sockety. <\/p>\n

Nagle\u016fv algoritmus se pou\u017e\u00edv\u00e1 pro agregaci drobn\u00fdch zpr\u00e1v za \u00fa\u010delem sn\u00ed\u017een\u00ed provozu. Algoritmus pozastavuje odes\u00edl\u00e1n\u00ed nov\u00fdch TCP segment\u016f do doby, ne\u017e obdr\u017e\u00ed potvrzen\u00ed o p\u0159ijet\u00ed p\u0159edchoz\u00edch dat nebo do vypr\u0161en\u00ed \u010dasov\u00e9ho limitu. Nap\u0159\u00edklad bez pou\u017eit\u00ed agregace se p\u0159i odes\u00edl\u00e1n\u00ed 1 bajtu nav\u00edc ode\u0161le 40 bajt\u016f s TCP a IP hlavi\u010dkami bal\u00ed\u010dku, zat\u00edmco p\u0159i pou\u017eit\u00ed Nagleova algoritmu \u2014 zpr\u00e1vy odeslan\u00e9 p\u0159ed p\u0159\u00edchodem potvrzen\u00ed od vzd\u00e1len\u00e9 strany se hromad\u00ed a odes\u00edlaj\u00ed jako jeden bal\u00edk. Vzhledem k optimalizaci \u201edelayed ACK\u201c, kter\u00e1 zpo\u017e\u010fuje odes\u00edl\u00e1n\u00ed ACK bal\u00ed\u010dk\u016f, sign\u00e1l prost\u0159ednictv\u00edm potvrzovac\u00edch bal\u00ed\u010dk\u016f ve skute\u010dnosti nefunguje a odes\u00edl\u00e1n\u00ed nahromad\u011bn\u00fdch zpr\u00e1v se prov\u00e1d\u00ed p\u0159i vypr\u0161en\u00ed \u010dasov\u00e9ho limitu. <\/p>\n

Snijders se domn\u00edv\u00e1, \u017ee v dne\u0161n\u00edm prost\u0159ed\u00ed je Nagle\u016fv algoritmus, vyvinut\u00fd v dob\u011b, kdy n\u011bkolik u\u017eivatel\u016f soupe\u0159ilo o \u0161\u00ed\u0159ku p\u00e1sma 1200 bps, zastaral\u00fd a v vysokorychlostn\u00edch s\u00edt\u00edch<\/a> je v\u00edce \u0161kody ne\u017e u\u017eitku. Ned\u00e1vno podobn\u00fd n\u00e1zor vyj\u00e1d\u0159il tak\u00e9 Marc Brooker ze spole\u010dnosti Amazon Web Services (AWS). S argumenty pro vypnut\u00ed Nagleova algoritmu ve v\u00fdchoz\u00edm nastaven\u00ed se m\u016f\u017eete sezn\u00e1mit v \u010dl\u00e1nku zve\u0159ejn\u011bn\u00e9m p\u0159ed n\u011bkolika dny. <\/p>\n

Pro deaktivaci Nagleova algoritmu je k dispozici mo\u017enost TCP_NODELAY, kter\u00e1 m\u016f\u017ee b\u00fdt nastavena pro jednotliv\u00e9 s\u00ed\u0165ov\u00e9 sokety. Re\u017eim TCP_NODELAY je ji\u017e dlouho nastaven v mnoha aplikac\u00edch OpenBSD, mezi kter\u00e9 pat\u0159\u00ed openssh, httpd, iscsid, relayd, bgpd a unwind, a podle n\u00e1zoru Snijderse p\u0159i\u0161el \u010das poskytnout mo\u017enost jeho aktivace pro v\u0161echny TCP sokety na \u00farovni cel\u00e9ho syst\u00e9mu. Snijders tak\u00e9 navrhuje projednat ot\u00e1zku aktivace TCP_NODELAY ve v\u00fdchoz\u00edm nastaven\u00ed a p\u0159eveden\u00ed Nagleova algoritmu do kategorie samostatn\u00e9 voliteln\u00e9 mo\u017enosti.
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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