{"id":105185,"date":"2022-09-27T21:36:41","date_gmt":"2022-09-27T19:36:41","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/v-yadre-linux-najdena-zabytaya-zaplata-vliyayushhaya-na-proizvoditelnost-cpu-amd"},"modified":"2022-09-27T21:36:41","modified_gmt":"2022-09-27T19:36:41","slug":"v-yadre-linux-najdena-zabytaya-zaplata-vliyayushhaya-na-proizvoditelnost-cpu-amd","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/v-yadre-linux-najdena-zabytaya-zaplata-vliyayushhaya-na-proizvoditelnost-cpu-amd","title":{"rendered":"V j\u00e1dru Linux byla nalezena zapomenut\u00e1 oprava, kter\u00e1 ovliv\u0148uje v\u00fdkon CPU AMD","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V j\u00e1dru Linux 6.0, jeho\u017e vyd\u00e1n\u00ed je o\u010dek\u00e1v\u00e1no p\u0159\u00ed\u0161t\u00ed pond\u011bl\u00ed, byla p\u0159ijata zm\u011bna, kter\u00e1 \u0159e\u0161\u00ed probl\u00e9my s v\u00fdkonem syst\u00e9m\u016f na procesorech AMD Zen. P\u0159\u00ed\u010dinou poklesu v\u00fdkonu byl k\u00f3d, kter\u00fd byl p\u0159id\u00e1n p\u0159ed 20 lety k obran\u011b proti hardwarov\u00e9mu probl\u00e9mu v n\u011bkter\u00fdch \u010dipsetech. Tento hardwarov\u00fd probl\u00e9m byl d\u00e1vno odstran\u011bn a neprojevuje se v modern\u00edch \u010dipsetech, ale star\u00fd obran\u00fd mechanismus byl zapomenut a stal se zdrojem poklesu v\u00fdkonu na syst\u00e9mech zalo\u017een\u00fdch na sou\u010dasn\u00fdch CPU AMD. Nov\u00e9 syst\u00e9my na CPU Intel nejsou t\u00edmto star\u00fdm obran\u00fdm man\u00e9vrem ovlivn\u011bny, proto\u017ee v nich je p\u0159\u00edstup k ACPI realizov\u00e1n pomoc\u00ed samostatn\u00e9ho ovlada\u010de intel_idle, nikoli spole\u010dn\u00e9ho ovlada\u010de processor_idle. <\/p>\n

Obran\u00fd man\u00e9vr byl p\u0159id\u00e1n do j\u00e1dra v b\u0159eznu 2002 za \u00fa\u010delem blokov\u00e1n\u00ed projevu chyby v \u010dipsetech, souvisej\u00edc\u00ed s nedostate\u010dn\u00fdm nastaven\u00edm stavu ne\u010dinnosti (idle) kv\u016fli zpo\u017ed\u011bn\u00ed zpracov\u00e1n\u00ed sign\u00e1lu STPCLK#. Pro obran\u00fd probl\u00e9m v implementaci ACPI byla p\u0159id\u00e1na dodate\u010dn\u00e1 instrukce WAIT, kter\u00e1 zpomalila procesor, aby \u010dipset st\u00edhal p\u0159ej\u00edt do stavu ne\u010dinnosti. P\u0159i profilov\u00e1n\u00ed pomoc\u00ed instrukc\u00ed IBS (Instruction-Based Sampling) na procesorech AMD Zen3 bylo zji\u0161t\u011bno, \u017ee procesor tr\u00e1v\u00ed v\u00fdznamnou \u010d\u00e1st \u010dasu vykon\u00e1v\u00e1n\u00edm zbyte\u010dn\u00e9ho k\u00f3du, kter\u00fd vede k nespr\u00e1vn\u00e9 interpretaci stavu z\u00e1t\u011b\u017ee procesoru a vy\u017eadov\u00e1n\u00ed hlub\u0161\u00edch stav\u016f sp\u00e1nku (C-State) zpracovatelem cpuidle. <\/p>\n

Takov\u00e9 chov\u00e1n\u00ed se odr\u00e1\u017e\u00ed v poklesu v\u00fdkonu p\u0159i z\u00e1t\u011b\u017e\u00edch, kde se \u010dasto st\u0159\u00eddaj\u00ed stavy ne\u010dinnosti (idle) a aktivity (busy). Nap\u0159\u00edklad p\u0159i pou\u017eit\u00ed patche, kter\u00fd obran\u00fd man\u00e9vr deaktivuje, se pr\u016fm\u011brn\u00e9 v\u00fdsledky testu tbench zv\u00fd\u0161ily z 32191 MB\/s na 33805 MB\/s.
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u044f\u0434\u0440\u043e Linux 6.0, \u0440\u0435\u043b\u0438\u0437 \u043a\u043e\u0442\u043e\u0440\u043e\u0433\u043e \u043e\u0436\u0438\u0434\u0430\u0435\u0442\u0441\u044f \u0432 \u0441\u043b\u0435\u0434\u0443\u044e\u0449\u0438\u0439 \u043f\u043e\u043d\u0435\u0434\u0435\u043b\u044c\u043d\u0438\u043a, \u043f\u0440\u0438\u043d\u044f\u0442\u043e \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u0435, \u0440\u0435\u0448\u0430\u044e\u0449\u0435\u0435 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0441 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c\u044e \u0441\u0438\u0441\u0442\u0435\u043c \u043d\u0430 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u0430\u0445 AMD Zen. \u0418\u0441\u0442\u043e\u0447\u043d\u0438\u043a\u043e\u043c \u043f\u0430\u0434\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438 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\u0431\u044b\u043b \u0437\u0430\u0431\u044b\u0442 \u0438 \u0441\u0442\u0430\u043b […]<\/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-105185","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 byla nalezena zapomenut\u00e1 oprava, kter\u00e1 ovliv\u0148uje v\u00fdkon CPU AMD | ProHoster","description":"V j\u00e1dru Linux 6.0, jeho\u017e vyd\u00e1n\u00ed je o\u010dek\u00e1v\u00e1no p\u0159\u00ed\u0161t\u00ed pond\u011bl\u00ed, byla p\u0159ijata zm\u011bna, kter\u00e1 \u0159e\u0161\u00ed probl\u00e9my s v\u00fdkonem syst\u00e9m\u016f na procesorech AMD Zen.","canonical_url":"https:\/\/prohoster.info\/cs\/blog\/news\/v-yadre-linux-najdena-zabytaya-zaplata-vliyayushhaya-na-proizvoditelnost-cpu-amd","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"cs_CZ","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0412 \u044f\u0434\u0440\u0435 Linux \u043d\u0430\u0439\u0434\u0435\u043d\u0430 \u0437\u0430\u0431\u044b\u0442\u0430\u044f \u0437\u0430\u043f\u043b\u0430\u0442\u0430, \u0432\u043b\u0438\u044f\u044e\u0449\u0430\u044f \u043d\u0430 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