{"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\/hr\/blog\/news\/v-yadre-linux-najdena-zabytaya-zaplata-vliyayushhaya-na-proizvoditelnost-cpu-amd","title":{"rendered":"U Linux jezgru prona\u0111en je zaboravljen zakrpa koja utje\u010de na performanse AMD CPU-a.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

U jezgru Linux 6.0, \u010dije je objavljivanje zakazano za sljede\u0107i ponedjeljak, donesena je izmjena koja rje\u0161ava probleme s performansama sustava na AMD Zen procesorima. Izvor pada performansi bio je kod dodan prije 20 godina kao zaobila\u017eenje hardverskog problema u nekim \u010dipsetima. Taj je hardverski problem odavno uklonjen i ne pojavljuje se u aktualnim \u010dipsetima, ali je stari zaobilazni problem zaboravljen, \u0161to je postalo izvor smanjenja performansi na sustavima temeljenim na modernim AMD CPU-ima. Nove sustave s Intel CPU-ima stari zaobilazni manevar ne poga\u0111a, jer se pristup ACPI-ju u njima ostvaruje pomo\u0107u posebnog drajvera intel_idle, a ne zajedni\u010dkog drajvera processor_idle. <\/p>\n

Zaobilazni manevar dodan je u jezgro u o\u017eujku 2002. godine kako bi se blokirale manifestacije gre\u0161ke u \u010dipsetima, vezane za nedostatak pravilnog postavljanja stanja mirovanja (idle) zbog ka\u0161njenja obrade signala STPCLK#. Da bi se problem u implementaciji ACPI-ja zaobi\u0161ao, dodavana je dodatna instrukcija WAIT koja usporava procesor kako bi \u010dipset imao vremena pre\u0107i u stanje mirovanja. Profiliranjem pomo\u0107u instrukcija IBS (Instruction-Based Sampling) na AMD Zen3 procesorima otkriveno je da procesor provodi zna\u010dajno vrijeme izvr\u0161avaju\u0107i <\/p>\n

smanjenje performansi u optere\u0107enjima u kojima se \u010desto izmjenjuju stanja mirovanja (idle) i aktivnosti (busy). Na primjer, kori\u0161tenjem zakrpe koja isklju\u010duje zaobilazni manevar, prosje\u010dni rezultati testa tbench pove\u0107avaju se 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":"

\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\udd47U jezgru Linux prona\u0111ena je zaboravljena zakrpa koja utje\u010de na performanse CPU-a AMD | ProHoster","description":"U jezgru Linux 6.0, \u010dije je objavljivanje zakazano za sljede\u0107i ponedjeljak, donesena je izmjena koja rje\u0161ava probleme s performansama sustava na AMD Zen 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