{"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\/it\/blog\/novosti-interneta\/obsuzhdenie-uvelicheniya-chastoty-tajmera-v-yadre-linux-do-1000hz-po-umolchaniyu","title":{"rendered":"Discussione sull'aumento della frequenza del timer nel kernel Linux a 1000Hz di default","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Un ingegnere di Google ha proposto di elevare la frequenza di generazione delle interruzioni del timer nel kernel Linux a 1000Hz per default, il che porterebbe a un aumento della frequenza di switching tra i task e a una riduzione del quantum di tempo nel pianificatore di attivit\u00e0. Attualmente si utilizza 250Hz come compromesso tra prestazioni, latenza e consumo energetico. <\/p>\n

Con l'uso di display a 120Hz, tipici dei PC e dei dispositivi mobili moderni, una frequenza del timer di 250Hz porta a un'errore di quantizzazione del tempo paragonabile a met\u00e0 del tempo del frame, riducendo l'efficienza nella distribuzione delle risorse e impedendo di ottenere un rapporto ottimale tra prestazioni e consumo energetico. Il consumo energetico nei sistemi a bassa frequenza del timer pu\u00f2 risultare pi\u00f9 alto, poich\u00e9 il meccanismo DVFS (Dynamic Voltage and Frequency Scaling) adotta una strategia di scelta della frequenza pi\u00f9 aggressiva per evitare di rallentare l'esecuzione dei task. <\/p>\n

Si verifichano situazioni in cui un task ha gi\u00e0 completato le operazioni desiderate, richiedendo calcoli attivi, ma il processore continua a operare a una frequenza pi\u00f9 alta a causa dell'eterna dimensione del quantum di tempo che non \u00e8 ancora scaduto. Aumentare la frequenza di switching dei task potrebbe portare a una diminuzione del consumo energetico grazie a una gestione pi\u00f9 efficiente della frequenza dinamica (DVFS), una distribuzione pi\u00f9 precisa degli intervalli da parte del pianificatore di attivit\u00e0, un aggiornamento pi\u00f9 frequente delle statistiche di utilizzo della CPU e una riduzione del tempo in cui i task rimangono in attesa. <\/p>\n

Un altro ingegnere di Google ha suggerito di mantenere la frequenza del timer a 250Hz, poich\u00e9 un incremento nella frequenza di generazione delle interruzioni del timer potrebbe comportare un aumento del consumo energetico su dispositivi a bassa potenza, come le schede per Internet delle Cose. Secondo le sue stime, impostando la frequenza a 1000Hz anche su dispositivi Android, \u00e8 stato registrato un incremento del consumo della CPU del 7% in alcune situazioni. Con l'aumento della frequenza del timer, si osserva anche un risveglio pi\u00f9 frequente della CPU, dato che a 250Hz i timer impostati su intervalli t + 1 ms, t + 2 ms, t + 3 ms e t + 4 ms sarebbero raggruppati, producendo un'unica attivazione; mentre a 1000Hz si verificherebbero quattro risvegli separati. <\/p>\n

La risorsa Phoronix ha condotto un confronto delle prestazioni dei PC basati su CPU AMD Ryzen 9 9950X. La configurazione a 1000Hz ha mostrato risultati migliori nei test con Llama.cpp, nginx, SuperTuxKart, Selenium e durante le misurazioni dei tempi di compilazione del kernel. Negli esperimenti con Darktable, PostgreSQL, Unvanquished, Xonotic, Blender, SVT-AV1, RawTherapee, le prestazioni sono state superiori impostando a 250Hz. Alla frequenza di 1000Hz, il consumo energetico medio \u00e8 stato di 144.2W, il minimo di 0.18W e il massimo di 202.13W, mentre a 250Hz: medio 144.37W, minimo 0.07W, massimo di 202W.

\"Discussione<\/center>
\n
Fonte: 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 \u043f\u043b\u0430\u043d\u0438\u0440\u043e\u0432\u0449\u0438\u043a\u0435 \u0437\u0430\u0434\u0430\u0447. \u0412 \u0434\u0430\u043d\u043d\u044b\u0439 \u043c\u043e\u043c\u0435\u043d\u0442 \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0441\u044f 250Hz, \u043a\u0430\u043a \u043d\u0435\u043a\u0438\u0439 \u043a\u043e\u043c\u043f\u0440\u043e\u043c\u0438\u0441\u0441 \u043c\u0435\u0436\u0434\u0443 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c\u044e, \u0437\u0430\u0434\u0435\u0440\u0436\u043a\u0430\u043c\u0438 \u0438 \u044d\u043d\u0435\u0440\u0433\u043e\u043f\u043e\u0442\u0440\u0435\u0431\u043b\u0435\u043d\u0438\u0435\u043c. \u041f\u0440\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 \u0434\u0438\u0441\u043f\u043b\u0435\u0435\u0432 \u0441 \u0447\u0430\u0441\u0442\u043e\u0442\u043e\u0439 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f 120Hz, \u0442\u0438\u043f\u0438\u0447\u043d\u044b\u0445 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":121916,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-121915","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-novosti-interneta"],"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\udd47Discussione sull'aumento della frequenza del timer nel kernel Linux a 1000Hz di default | ProHoster","description":"Un ingegnere di Google ha proposto di aumentare la frequenza di generazione delle interruzioni del timer nel kernel Linux a 1000Hz per impostazione predefinita, il che comporterebbe un aumento della frequenza di commutazione delle attivit\u00e0 e una riduzione del quantum di tempo nel pianificatore delle attivit\u00e0. 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