{"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\/ro\/blog\/news\/v-yadre-linux-najdena-zabytaya-zaplata-vliyayushhaya-na-proizvoditelnost-cpu-amd","title":{"rendered":"O patch uitat a fost g\u0103sit \u00een kernelul Linux, afect\u00e2nd performan\u021ba CPU AMD","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

\u00cen kernelul Linux 6.0, a c\u0103rui lansare este a\u0219teptat\u0103 luni viitoare, a fost adoptat\u0103 o modificare care rezolv\u0103 problemele de performan\u021b\u0103 ale sistemelor pe procesoare AMD Zen. Sursa c\u0103derii de performan\u021b\u0103 a fost un cod ad\u0103ugat acum 20 de ani pentru a ocoli o problem\u0103 hardware din anumite chipseturi. Problema hardware a fost deja rezolvat\u0103 \u0219i nu mai apare \u00een chipseturile actuale, dar vechea ocolire a fost uitat\u0103 \u0219i a devenit o surs\u0103 de sc\u0103dere a performan\u021bei pe sistemele bazate pe CPU-uri AMD moderne. Noile sisteme cu CPU Intel nu sunt afectate de vechea ocolire, deoarece acestea acceseaz\u0103 ACPI prin intermediul unui driver separat intel_idle, \u0219i nu prin driverul comun processor_idle. <\/p>\n

Ocolirea a fost ad\u0103ugat\u0103 \u00een kernel \u00een martie 2002 pentru a bloca manifestarea erorii \u00een chipseturi, asociat\u0103 cu absen\u021ba unei instal\u0103ri corecte a st\u0103rii de inactivitate (idle) din cauza \u00eent\u00e2rzierii \u00een procesarea semnalului STPCLK#. Pentru a ocoli aceast\u0103 problem\u0103 \u00een implementarea ACPI, a fost ad\u0103ugat\u0103 o instruc\u021biune suplimentar\u0103 WAIT, care \u00eencetinea procesorul pentru a permite chipsetului s\u0103 treac\u0103 \u00een starea de inactivitate. \u00cen urma profil\u0103rii utiliz\u00e2nd instruc\u021biunile IBS (Instruction-Based Sampling) pe procesoarele AMD Zen3, s-a constatat c\u0103 procesorul petrece un timp semnificativ execut\u00e2nd o fereal\u0103 care duce la o interpretare gre\u0219it\u0103 a st\u0103rii de \u00eenc\u0103rcare pe procesor \u0219i la stabilirea unor moduri de somn mai profunde (C-State) de c\u0103tre procesorul cpuidle. <\/p>\n

O astfel de comportare se reflect\u0103 \u00een sc\u0103derea performan\u021bei \u00een sarcinile \u00een care st\u0103rile de inactivitate (idle) \u0219i activitate (busy) se alterneaz\u0103 frecvent. De exemplu, utiliz\u00e2nd un patch care dezactiveaz\u0103 ocolirea, mediile testului tbench cresc de la 32191 MB\/s la 33805 MB\/s.
\n
Sursa: opennet.ro<\/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\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\udd47O patch uitat a fost g\u0103sit \u00een kernelul Linux, afect\u00e2nd performan\u021ba CPU AMD | ProHoster","description":"\u00cen kernelul Linux 6.0, a c\u0103rui lansare este a\u0219teptat\u0103 luni viitoare, a fost adoptat\u0103 o modificare care rezolv\u0103 problemele de performan\u021b\u0103 ale sistemelor pe procesoare AMD 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