{"id":121915,"date":"2025-02-13T20:22:13","date_gmt":"2025-02-13T18:22:13","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/obsuzhdenie-uvelicheniya-chastoty-tajmera-v-yadre-linux-do-1000hz-po-umolchaniyu"},"modified":"2025-02-13T20:22:13","modified_gmt":"2025-02-13T18:22:13","slug":"obsuzhdenie-uvelicheniya-chastoty-tajmera-v-yadre-linux-do-1000hz-po-umolchaniyu","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sv\/blog\/news\/obsuzhdenie-uvelicheniya-chastoty-tajmera-v-yadre-linux-do-1000hz-po-umolchaniyu","title":{"rendered":"Diskussion om att \u00f6ka timerfrekvensen i Linux-k\u00e4rnan till 1000Hz som standard","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Ingenj\u00f6r fr\u00e5n Google f\u00f6reslog att \u00f6ka frekvensen f\u00f6r timerinterruptioner i Linux-k\u00e4rnan till 1000Hz som standard, vilket skulle leda till en \u00f6kning av uppgiftsswitchningsfrekvensen och en minskning av tidskvantumet i schemal\u00e4ggaren. F\u00f6r n\u00e4rvarande anv\u00e4nds 250Hz som standard, som en kompromiss mellan prestanda, f\u00f6rdr\u00f6jningar och energif\u00f6rbrukning. <\/p>\n

Vid anv\u00e4ndning av sk\u00e4rmar med uppdateringsfrekvensen 120Hz, typiska f\u00f6r moderna datorer och mobila enheter, \u00e4r kvantiseringsfel vid en timerfrekvens p\u00e5 250Hz ungef\u00e4r h\u00e4lften av bildtiden, vilket minskar effektiviteten i resursf\u00f6rdelningen och f\u00f6rhindrar att man uppn\u00e5r optimal balans mellan prestanda och energif\u00f6rbrukning. Energif\u00f6rbrukningen hos systemen vid l\u00e5g timerfrekvens kan vara h\u00f6gre, eftersom DVFS-mekanismen (Dynamic Voltage and Frequency Scaling) anv\u00e4nder en mer aggressiv strategi f\u00f6r frekvensval f\u00f6r att undvika f\u00f6rdr\u00f6jning av uppgiftens utf\u00f6rande. <\/p>\n

Det uppst\u00e5r situationer d\u00e4r en uppgift redan har utf\u00f6rt \u00f6nskade operationer som kr\u00e4vde aktiv ber\u00e4kning, men processorn forts\u00e4tter att arbeta vid h\u00f6gre frekvens p\u00e5 grund av att tidskvantumet fortfarande p\u00e5g\u00e5r. \u00d6kningen av uppgiftsswitchningsfrekvensen kan leda till minskad energif\u00f6rbrukning genom att \u00f6ka effektiviteten i dynamisk frekvenskontroll (DVFS), mer exakt f\u00f6rdelning av intervall av schemal\u00e4ggaren, mer frekvent uppdatering av CPU-belastningsstatistik och minskad tid som uppgifter befinner sig i v\u00e4ntel\u00e4ge. <\/p>\n

En annan ingenj\u00f6r fr\u00e5n Google f\u00f6reslog att beh\u00e5lla timerfrekvensen som den \u00e4r (250 Hz), eftersom en \u00f6kning av frekvensen f\u00f6r timeravbrott kan leda till h\u00f6gre energif\u00f6rbrukning p\u00e5 svaga enheter, s\u00e5som kort f\u00f6r Internet of Things. Enligt hans bed\u00f6mning, n\u00e4r frekvensen st\u00e4lls in p\u00e5 1000 Hz, har det registrerats en \u00f6kning av processorns energif\u00f6rbrukning med 7 % i vissa situationer \u00e4ven p\u00e5 Android-enheter. Vid en \u00f6kning av timerfrekvensen observeras ocks\u00e5 att CPU:n v\u00e4cks oftare, eftersom vid 250 Hz kommer timers inst\u00e4llda p\u00e5 intervallerna t + 1 ms, t + 2 ms, t + 3 ms och t + 4 ms att grupperas och leda till en enda v\u00e4ckning, medan det vid 1000 Hz kommer att ske fyra separata v\u00e4ckningar. <\/p>\n

Resursen Phoronix har genomf\u00f6rt en j\u00e4mf\u00f6relse av prestanda f\u00f6r PC med AMD Ryzen 9 9950X. Konfigurationen med 1000Hz visade sig vara snabbare i test som Llama.cpp, nginx, SuperTuxKart, Selenium och vid m\u00e4tning av tid f\u00f6r k\u00e4rnkompilering. I testerna av Darktable, PostgreSQL, Unvanquished, Xonotic, Blender, SVT-AV1, RawTherapee var prestandan h\u00f6gre med 250Hz. Vid 1000Hz var den genomsnittliga energif\u00f6rbrukningen 144.2 W, minimalt 0.18 W, maximalt 202.13 W, medan den vid 250Hz var: genomsnitt 144.37 W, minimum 0.07 W, maximum 202 W.

\"Diskussion<\/center>
\n
K\u00e4lla: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0418\u043d\u0436\u0435\u043d\u0435\u0440 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Google \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0438\u043b \u043f\u043e\u0432\u044b\u0441\u0438\u0442\u044c \u0447\u0430\u0441\u0442\u043e\u0442\u0443 \u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u0438 \u043f\u0440\u0435\u0440\u044b\u0432\u0430\u043d\u0438\u0439 \u043e\u0442 \u0442\u0430\u0439\u043c\u0435\u0440\u0430 \u0432 \u044f\u0434\u0440\u0435 Linux \u0434\u043e 1000Hz \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e, \u0447\u0442\u043e \u043f\u0440\u0438\u0432\u0435\u0434\u0451\u0442 \u043a \u0443\u0432\u0435\u043b\u0438\u0447\u0435\u043d\u0438\u044e \u0447\u0430\u0441\u0442\u043e\u0442\u044b \u043f\u0435\u0440\u0435\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044f \u0437\u0430\u0434\u0430\u0447 \u0438 \u0443\u043c\u0435\u043d\u044c\u0448\u0435\u043d\u0438\u044e \u043a\u0432\u0430\u043d\u0442\u0430 \u0432\u0440\u0435\u043c\u0435\u043d\u0438 \u0432 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