{"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\/sv\/blog\/news\/v-yadre-linux-najdena-zabytaya-zaplata-vliyayushhaya-na-proizvoditelnost-cpu-amd","title":{"rendered":"En bortgl\u00f6md patch har hittats i Linux-k\u00e4rnan som p\u00e5verkar prestandan hos AMD:s CPU:er","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

I Linux 6.0, som sl\u00e4pps n\u00e4sta m\u00e5ndag, har en f\u00f6r\u00e4ndring antagits som l\u00f6ser prestandaproblem f\u00f6r system med AMD Zen-processorer. K\u00e4llan till prestandafallet var kod som lades till f\u00f6r 20 \u00e5r sedan f\u00f6r att kringg\u00e5 ett h\u00e5rdvaruproblem i vissa chipset. H\u00e5rdvaruproblemet har l\u00e4nge \u00e5tg\u00e4rdats och f\u00f6rekommer inte i aktuella chipset, men den gamla l\u00f6sningen har gl\u00f6mts bort och blivit en k\u00e4lla till prestandaf\u00f6rlust i system baserade p\u00e5 moderna AMD CPU:er. Nya system med Intel CPU:er p\u00e5verkas inte av den gamla workaround, eftersom de har tillg\u00e5ng till ACPI via en separat drivrutin intel_idle, ist\u00e4llet f\u00f6r en gemensam drivrutin processor_idle. <\/p>\n

Workaround-l\u00f6sningen lades till i k\u00e4rnan i mars 2002 f\u00f6r att blockera manifestationer av ett fel i chipsets relaterat till avsaknad av korrekt idle-l\u00e4ge p\u00e5 grund av f\u00f6rdr\u00f6jning i STPCLK#-signalbehandling. F\u00f6r att kringg\u00e5 problemet i ACPI-implementeringen lades en extra WAIT-instruktion till, vilket saktade ner processorn f\u00f6r att chipset skulle hinna \u00f6verg\u00e5 till idle-l\u00e4ge. Profilering med hj\u00e4lp av IBS (Instruction-Based Sampling) p\u00e5 AMD Zen3-processorer har visat att processorn spenderar betydande tid p\u00e5 att utf\u00f6ra en dummy-\u00e5tg\u00e4rd som leder till felaktig tolkning av processorbelastning och tilldelning av djupare vilol\u00e4gen (C-State) av cpuidle-hanteraren. <\/p>\n

Ett s\u00e5dant beteende resulterar i s\u00e4nkt prestanda under belastningar d\u00e4r idle- och busy-tillst\u00e5nd ofta v\u00e4xlar. Till exempel, n\u00e4r en patch som inaktiverar workarounds anv\u00e4ndes, \u00f6kade de genomsnittliga resultaten i tbench-testet fr\u00e5n 32191 MB\/s till 33805 MB\/s.
\n
K\u00e4lla: 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\udd47En gl\u00f6md patch har uppt\u00e4ckts i k\u00e4rnan i Linux som p\u00e5verkar prestandan f\u00f6r AMD CPU:er | ProHoster","description":"I Linux 6.0, som sl\u00e4pps n\u00e4sta m\u00e5ndag, har en f\u00f6r\u00e4ndring antagits som l\u00f6ser prestandaproblem f\u00f6r system med AMD 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AMD | 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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