{"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\/sl\/blog\/news\/v-yadre-linux-najdena-zabytaya-zaplata-vliyayushhaya-na-proizvoditelnost-cpu-amd","title":{"rendered":"V jedru Linux je bila najdena pozabljena zakrpa, ki vpliva na zmogljivost procesorjev AMD.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V jedru Linux 6.0, katerega izid je predviden naslednji ponedeljek, je bila sprejeta sprememba, ki re\u0161uje te\u017eave z zmogljivostjo sistemov na procesorjih AMD Zen. Vir upada zmogljivosti je bil koda, dodana pred 20 leti za obhod strojne te\u017eave v nekaterih \u010dipovjih. Strojna te\u017eava je \u017ee dolgo odpravljena in se ne pojavlja v sodobnih \u010dipovjih, toda stari obvod je bil pozabljen in je postal vir zmanj\u0161anja zmogljivosti v sistemih, ki temeljijo na sodobnih procesorjih AMD. Novi sistemi s procesorji Intel starega obvodnega manevra ne prizadenejo, saj se v njih dostop do ACPI izvaja s pomo\u010djo lo\u010denega gonilnika intel_idle, namesto skupnega gonilnika processor_idle. <\/p>\n

Obvodni manever je bil dodan v jedro marca 2002 za blokiranje manifestacije napake v \u010dipovjih, povezane z odsotnostjo ustrezne nastavitve stanja brez aktivnosti (idle) zaradi zamude pri obdelavi signala STPCLK#. Da bi se ob\u0161la te\u017eava v implementaciji ACPI, je bila dodana dodatna instrukcija WAIT, ki upo\u010dasni procesor, da bi se \u010dipovje lahko pravo\u010dasno preklopilo v stanje brez aktivnosti. Med profiliranjem s pomo\u010djo instrukcij IBS (Instruction-Based Sampling) na procesorjih AMD Zen3 je bilo ugotovljeno, da procesor porabi znatno \u010das za izvajanje blokade, kar vodi v napa\u010dno interpretacijo stanja obremenitve procesorja in nastavitev globljih na\u010dinov spanja (C-State) obdelovalniku cpuidle. <\/p>\n

To vedenje se odra\u017ea v zmanj\u0161anju zmogljivosti pri obremenitvah, kjer se pogosto izmenjujeta stanja brez aktivnosti (idle) in aktivnosti (busy). Na primer, pri uporabi popravka, ki onemogo\u010da obvodni manever, se povpre\u010dni rezultati testa tbench pove\u010dajo s 32191 MB\/s na 33805 MB\/s.
\n
Izvor: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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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 jedru Linux je bila odkrita pozabljena popravka, ki vpliva na zmogljivost CPU AMD | ProHoster","description":"V jedru Linux 6.0, katerega izid je predviden naslednji ponedeljek, je bila sprejeta sprememba, ki re\u0161uje te\u017eave z zmogljivostjo sistemov na procesorjih AMD 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ProHoster","og:description":"\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 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