{"id":167524,"date":"2026-04-04T23:11:54","date_gmt":"2026-04-04T21:11:54","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/v-yadre-linux-7-0-vyyavili-regressiyu-v-dva-raza-snizhayushhuyu-proizvoditelnost-postgresql"},"modified":"2026-04-04T23:11:54","modified_gmt":"2026-04-04T21:11:54","slug":"v-yadre-linux-7-0-vyyavili-regressiyu-v-dva-raza-snizhayushhuyu-proizvoditelnost-postgresql","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/v-yadre-linux-7-0-vyyavili-regressiyu-v-dva-raza-snizhayushhuyu-proizvoditelnost-postgresql","title":{"rendered":"V j\u00e1d\u0159e Linux 7.0 byla odhalena regrese, kter\u00e1 sni\u017euje v\u00fdkon PostgreSQL na polovinu","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

In\u017een\u00fdr z firmy Amazon odhalil regresi specifickou pro j\u00e1dro Linux 7.0, jeho\u017e vyd\u00e1n\u00ed se o\u010dek\u00e1v\u00e1 13. dubna. Zm\u011bna nastaven\u00ed pl\u00e1nova\u010de \u00faloh vedla k v\u00fdrazn\u00e9mu sn\u00ed\u017een\u00ed propustnosti a odezvy p\u0159i pr\u00e1ci s datab\u00e1z\u00ed PostgreSQL na syst\u00e9mech s architekturou ARM64. P\u0159i pou\u017eit\u00ed j\u00e1dra 7.0 se v\u00fdkon p\u0159i testu pgbench 'simple-update' sn\u00ed\u017eil t\u00e9m\u011b\u0159 na polovinu \u2014 z 98565 na 50751. <\/p>\n

Zpomalen\u00ed je zp\u016fsobeno zm\u011bnou re\u017eimu p\u0159ednostn\u00edho p\u0159id\u011blov\u00e1n\u00ed (preemption) v pl\u00e1nova\u010di \u00faloh z PREEMPT_NONE na PREEMPT_LAZY na architektur\u00e1ch, kter\u00e9 tento re\u017eim podporuj\u00ed, co\u017e zp\u016fsobilo, \u017ee u\u017eivatelsk\u00fd prostor PostgreSQL str\u00e1vil 55 % \u010dasu CPU na vol\u00e1n\u00ed s_lock(). Pro vy\u0159e\u0161en\u00ed probl\u00e9mu bylo navr\u017eeno vr\u00e1tit re\u017eim PREEMPT_NONE jako v\u00fdchoz\u00ed a odstranit jeho vazbu na nastaven\u00ed ARCH_NO_PREEMPT. <\/p>\n

Peter Zijlstra, autor zm\u011bn, kter\u00e9 zp\u016fsobily regresi, a spr\u00e1vce pl\u00e1nova\u010de \u00faloh a souvisej\u00edc\u00edch blokovac\u00edch subsyst\u00e9m\u016f j\u00e1dra, prohl\u00e1sil, \u017ee opravu je t\u0159eba prov\u00e9st v k\u00f3du PostgreSQL. K odstran\u011bn\u00ed poklesu v\u00fdkonu doporu\u010dil vyu\u017e\u00edt v PostgreSQL ned\u00e1vno p\u0159idan\u00e9 roz\u0161\u00ed\u0159en\u00ed 'rseq slice' (Restartovateln\u00e9 sekvence) pro omezen\u00ed pravd\u011bpodobnosti vys\u00eddlen\u00ed dr\u017eitele z\u00e1mku. <\/p>\n

Zat\u00edm nen\u00ed jasn\u00e9, jak\u00e9 \u0159e\u0161en\u00ed p\u0159ijme Linus Torvalds, kter\u00fd dodr\u017euje pravidlo, \u017ee j\u00e1dro by nem\u011blo zhor\u0161ovat v\u00fdkon a naru\u0161ovat kompatibilitu s u\u017eivatelsk\u00fdm prostorem. Na jedn\u00e9 stran\u011b se j\u00e1dro 7.0 nach\u00e1z\u00ed ve fin\u00e1ln\u00ed f\u00e1zi testov\u00e1n\u00ed p\u0159ed vyd\u00e1n\u00edm a vr\u00e1cen\u00ed nastaven\u00ed pl\u00e1nova\u010de m\u016f\u017ee zp\u016fsobit dal\u0161\u00ed regrese, na druh\u00e9 stran\u011b se u\u017eivatel\u00e9 mohou setkat s poklesem v\u00fdkonu jedn\u00e9 z nejpopul\u00e1rn\u011bj\u0161\u00edch datab\u00e1z\u00ed na polovinu.
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0418\u043d\u0436\u0435\u043d\u0435\u0440 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Amazon \u0432\u044b\u044f\u0432\u0438\u043b \u0440\u0435\u0433\u0440\u0435\u0441\u0441\u0438\u044e, \u0441\u043f\u0435\u0446\u0438\u0444\u0438\u0447\u043d\u0443\u044e \u0434\u043b\u044f \u044f\u0434\u0440\u0430 Linux 7.0, \u0440\u0435\u043b\u0438\u0437 \u043a\u043e\u0442\u043e\u0440\u043e\u0433\u043e \u043e\u0436\u0438\u0434\u0430\u0435\u0442\u0441\u044f 13 \u0430\u043f\u0440\u0435\u043b\u044f. \u0418\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u0435 \u043d\u0430\u0441\u0442\u0440\u043e\u0435\u043a \u043f\u043b\u0430\u043d\u0438\u0440\u043e\u0432\u0449\u0438\u043a\u0430 \u0437\u0430\u0434\u0430\u0447 \u043f\u0440\u0438\u0432\u0435\u043b\u043e \u043a \u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0435\u043d\u043d\u043e\u043c\u0443 \u0441\u043d\u0438\u0436\u0435\u043d\u0438\u044e \u043f\u0440\u043e\u043f\u0443\u0441\u043a\u043d\u043e\u0439 \u0441\u043f\u043e\u0441\u043e\u0431\u043d\u043e\u0441\u0442\u0438 \u0438 \u043e\u0442\u0437\u044b\u0432\u0447\u0438\u0432\u043e\u0441\u0442\u0438 \u043f\u0440\u0438 \u0440\u0430\u0431\u043e\u0442\u0435 \u0421\u0423\u0411\u0414 PostgreSQL \u043d\u0430 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445 \u0441 \u0430\u0440\u0445\u0438\u0442\u0435\u043a\u0442\u0443\u0440\u043e\u0439 ARM64. \u041f\u0440\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 \u044f\u0434\u0440\u0430 7.0 \u043f\u043e\u043a\u0430\u0437\u0430\u0442\u0435\u043b\u0438 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u043f\u0440\u0438 \u043f\u0440\u043e\u0445\u043e\u0436\u0434\u0435\u043d\u0438\u0438 \u0442\u0435\u0441\u0442\u0430 pgbench «simple-update» \u0441\u043d\u0438\u0437\u0438\u043b\u0438\u0441\u044c \u043f\u043e\u0447\u0442\u0438 \u0432 \u0434\u0432\u0430 \u0440\u0430\u0437\u0430 — \u0441 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-167524","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\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\udd47V j\u00e1dru Linux 7.0 byla odhalena regrese, kter\u00e1 sni\u017euje v\u00fdkon PostgreSQL na polovinu | ProHoster","description":"In\u017een\u00fdr z Amazonu odhalil regresi specifickou pro j\u00e1dro Linux 7.0, jeho\u017e vyd\u00e1n\u00ed se o\u010dek\u00e1v\u00e1 13. 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