{"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\/da\/blog\/news\/obsuzhdenie-uvelicheniya-chastoty-tajmera-v-yadre-linux-do-1000hz-po-umolchaniyu","title":{"rendered":"Diskussion om at \u00f8ge timerens frekvens i Linux-kernen til 1000Hz som standard","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

En ingeni\u00f8r fra Google foreslog at \u00f8ge timerens afbrydelser i Linux-kernen til 1000Hz som standard, hvilket ville f\u00f8re til en h\u00f8jere opgave-switche frekvens og en reduktion af tid kvoterne i opgaveplanl\u00e6ggeren. I \u00f8jeblikket anvendes 250Hz som standard, som et kompromis mellem ydeevne, forsinkelser og energiforbrug. <\/p>\n

Ved brug af sk\u00e6rme med en opdateringsfrekvens p\u00e5 120Hz, som er typisk for moderne pc'er og mobile enheder, er tids kvoteringsfejlene ved en timer-frekvens p\u00e5 250Hz omtrent halvdelen af frame-tiden, hvilket s\u00e6nker ressourcefordelings effektiviteten og forhindrer, at man opn\u00e5r det optimale forhold mellem ydeevne og energieffektivitet. Energien i systemer med lav timer-frekvens kan vise sig at v\u00e6re h\u00f8jere, da DVFS (Dynamic Voltage and Frequency Scaling) mekanismen anvender en mere aggressiv strategi for at v\u00e6lge frekvensen, for ikke at forsinke udf\u00f8relsen af opgaver. <\/p>\n

Der opst\u00e5r situationer, hvor en opgave allerede har udf\u00f8rt de \u00f8nskede operationer, som kr\u00e6vede aktiv beregning, men processoren forts\u00e6tter med at k\u00f8re p\u00e5 en h\u00f8jere frekvens p\u00e5 grund af den begr\u00e6nsede tid kvote, som endnu ikke er afsluttet. En \u00f8get opgave-switche frekvens kan f\u00f8re til et lavere energiforbrug p\u00e5 grund af en mere effektiv dynamisk frekvensstyring (DVFS), en mere pr\u00e6cis fordeling af intervaller i opgaveplanl\u00e6ggeren, oftere opdatering af CPU belastningsstatistik og mindre tid, hvor opgaver venter. <\/p>\n

En anden ingeni\u00f8r fra Google foreslog at bevare timerens frekvens som den er (250Hz), da en stigning i timers afbrydelsesfrekvens kan f\u00f8re til en stigning i energiforbruget p\u00e5 lavt effektive enheder, s\u00e5som IoT-kort. If\u00f8lge hans vurdering kan en fastl\u00e6ggelse af frekvensen til 1000Hz selv p\u00e5 enheder, der k\u00f8rer Android, i nogle tilf\u00e6lde resultere i en stigning i CPU'ens energiforbrug p\u00e5 7%. Ved en stigning i timerens frekvens ses der ogs\u00e5 hyppigere v\u00e6kkelse af CPU'en, da ved 250Hz vil timere sat p\u00e5 intervaller t + 1 ms, t + 2 ms, t + 3 ms og t + 4 ms blive grupperet og f\u00f8re til \u00e9n v\u00e6kkelse, mens der ved 1000Hz vil ske fire separate v\u00e6kkelser. <\/p>\n

Phoronix har udf\u00f8rt en sammenligning af ydeevnen for PC'er med en AMD Ryzen 9 9950X CPU. Konfigurationen med 1000Hz viste sig at v\u00e6re hurtigere i testene af Llama.cpp, nginx, SuperTuxKart, Selenium og ved m\u00e5ling af kompileringstiden for kernen. I testene med Darktable, PostgreSQL, Unvanquished, Xonotic, Blender, SVT-AV1 og RawTherapee var ydeevnen bedre ved 250Hz. Ved 1000Hz var det gennemsnitlige str\u00f8mforbrug 144,2 W, minimum — 0,18 W, maksimum — 202,13 W, mens det ved 250Hz var: gennemsnit 144,37 W, minimum 0,07 W, maksimum — 202 W.

\"Diskussion<\/center>
\n
Kilde: 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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