{"id":161903,"date":"2026-02-20T17:11:55","date_gmt":"2026-02-20T15:11:55","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/razrabotchik-io_uring-vyyavil-v-qemu-problemu-v-50-80-raz-zamedlyavshuyu-fdmon-v-rezhime-prostoya"},"modified":"2026-02-20T17:11:55","modified_gmt":"2026-02-20T15:11:55","slug":"razrabotchik-io_uring-vyyavil-v-qemu-problemu-v-50-80-raz-zamedlyavshuyu-fdmon-v-rezhime-prostoya","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/razrabotchik-io_uring-vyyavil-v-qemu-problemu-v-50-80-raz-zamedlyavshuyu-fdmon-v-rezhime-prostoya","title":{"rendered":"Lo sviluppatore di io_uring ha identificato un problema in QEMU che rallentava fdmon da 50 a 80 volte in modalit\u00e0 inattiva.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Jens Axboe, creatore di io_uring e degli scheduler di input\/output CFQ, Deadline e Noop, ha proposto l'inserimento nel codice sorgente dell'emulatore QEMU di una patch che riduce da 50 a 80 volte i ritardi durante il monitoraggio dei descrittori di file (fdmon) in modalit\u00e0 'aio=io_uring' e mentre il sistema si trova in stato di inattivit\u00e0 (idle).     <\/p>\n<p>Il problema si manifestava a causa della traduzione dell'operazione ppoll() in uno stato di sleep con un timeout di 499 ms, nonostante la presenza di input\/output. Per riprendere l'esecuzione del ciclo principale di gestione degli eventi, sospeso a causa di ppoll(), \u00e8 stata proposta una patch che aggiunge una chiamata alla funzione aio_notify() nella funzione di creazione della voce SQE (Submission Queue Entry), per sbloccare ppoll() dallo stato di sleep.      <\/p>\n<p>Il problema \u00e8 emerso durante i test di regressione di io_uring in <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/it\/vps\/abuzoustojchivye-vps\/\"   title=\"macchine virtuali\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"4298\">macchine virtuali<\/a> con dispositivi a blocchi diversi. Jens ha notato un'apparente casualit\u00e0 dei timeout durante l'uso di dispositivi AHCI\/SATA in modalit\u00e0 'aio=io_uring', mentre nei test con dispositivi virtio-blk o nvme i risultati si chiudevano sempre con successo in circa un secondo. Si osserva che il problema coinvolge tutti i tipi di dispositivi a blocchi, ma per i dispositivi AHCI\/SATA i ritardi sono particolarmente evidenti a causa dell'uso di MMIO.            <\/p>\n<p>Jens ha anche descritto la sua esperienza di debugging del problema utilizzando l'assistente AI Claude. Dopo aver identificato lo scenario che riproduceva le condizioni per l'insorgenza del timeout, ha fornito i dati di debug a Claude, ha concesso accesso alla macchina virtuale e ha suggerito di identificare le probabili cause del guasto riscontrato.     <\/p>\n<p>Claude ha deciso di verificare se le prestazioni diminuissero utilizzando un dispositivo virtio-blk e ha eseguito con esso lo scenario distruttivo proposto dal suo sviluppatore, che riproduceva il problema. Durante il test, i primi 128 MB di contenuti del dispositivo a blocchi \/dev\/vda nella macchina virtuale sono stati rimossi. Successivamente, Claude ha concluso che il problema non era relativo a virtio-blk. Quando Jens ha chiesto all'assistente AI di rimuovere parte del contenuto di \/dev\/vda, questo ha risposto 'S\u00ec, l'ho fatto', e dopo aver richiesto di ripararlo, ha ripristinato il funzionamento del disco virtuale \/dev\/vda. Si osserva che l'uso dell'assistente AI ha aiutato a comprendere meglio le particolarit\u00e0 dell'esecuzione dei vari cicli di elaborazione degli eventi in QEMU.      <\/p>\n<p>\u00c8 notevole che il problema sia stato piuttosto difficile da identificare, poich\u00e9 nei test sintetici non si rileva alcun rallentamento a causa del risveglio del ciclo di eventi con ppoll da attivit\u00e0 diverse, e i test sintetici di input\/output non elaborano i dati ricevuti. Il rallentamento \u00e8 diventato pi\u00f9 evidente con l'aggiunta di diverse chiamate a usleep() per simulare l'elaborazione dei dati.      <\/p>\n<p>Prima della correzione, sul sistema in stato di inattivit\u00e0:          time sudo .\/iotest \/dev\/sda          Eseguito in   25.76 secs      fish           esterno        usr time    6.19 millis  783.00 micros    5.41 millis        sys time   12.43 millis  642.00 micros   11.79 millis      <\/p>\n<p>Dopo la correzione, sul sistema in stato di inattivit\u00e0:          time sudo .\/iotest \/dev\/sda          Eseguito in    1.30 secs      fish           esterno        usr time    2.14 millis    0.14 millis    2.00 millis        sys time   16.93 millis    1.16 millis   15.76 millis<br \/>\n<br \/>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=64834\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0419\u0435\u043d\u0441 \u042d\u043a\u0441\u0431\u043e (Jens Axboe), \u0441\u043e\u0437\u0434\u0430\u0442\u0435\u043b\u044c io_uring \u0438 \u043f\u043b\u0430\u043d\u0438\u0440\u043e\u0432\u0449\u0438\u043a\u043e\u0432 \u0432\u0432\u043e\u0434\u0430\/\u0432\u044b\u0432\u043e\u0434\u0430 CFQ, Deadline \u0438 Noop, \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0438\u043b \u0434\u043b\u044f \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044f \u0432 \u043a\u043e\u0434\u043e\u0432\u0443\u044e \u0431\u0430\u0437\u0443 \u044d\u043c\u0443\u043b\u044f\u0442\u043e\u0440\u0430 QEMU \u043f\u0430\u0442\u0447, \u0432 50-80 \u0440\u0430\u0437 \u0441\u043e\u043a\u0440\u0430\u0449\u0430\u044e\u0449\u0438\u0439 \u0437\u0430\u0434\u0435\u0440\u0436\u043a\u0438 \u043f\u0440\u0438 \u0440\u0430\u0431\u043e\u0442\u0435 fdmon (file descriptor monitoring) \u0432 \u0440\u0435\u0436\u0438\u043c\u0435 &#171;aio=io_uring&#187; \u0438 \u043d\u0430\u0445\u043e\u0436\u0434\u0435\u043d\u0438\u0438 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0432 \u0441\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0438 \u043f\u0440\u043e\u0441\u0442\u043e\u044f (idle). \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u043b\u0430\u0441\u044c \u0438\u0437-\u0437\u0430 \u043f\u0435\u0440\u0435\u0432\u043e\u0434\u0430 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438 ppoll() \u0432 \u0441\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0438 \u0441\u043d\u0430 \u0441 \u0442\u0430\u0439\u043c\u0430\u0443\u0442\u043e\u043c 499 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-161903","post","type-post","status-publish","format-standard","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0419\u0435\u043d\u0441 \u042d\u043a\u0441\u0431\u043e (Jens Axboe), \u0441\u043e\u0437\u0434\u0430\u0442\u0435\u043b\u044c io_uring \u0438 \u043f\u043b\u0430\u043d\u0438\u0440\u043e\u0432\u0449\u0438\u043a\u043e\u0432 \u0432\u0432\u043e\u0434\u0430\/\u0432\u044b\u0432\u043e\u0434\u0430 CFQ, Deadline \u0438 Noop, \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0438\u043b \u0434\u043b\u044f \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044f \u0432 \u043a\u043e\u0434\u043e\u0432\u0443\u044e \u0431\u0430\u0437\u0443 \u044d\u043c\u0443\u043b\u044f\u0442\u043e\u0440\u0430 QEMU \u043f\u0430\u0442\u0447, \u0432 50-80 \u0440\u0430\u0437 \u0441\u043e\u043a\u0440\u0430\u0449\u0430\u044e\u0449\u0438\u0439 \u0437\u0430\u0434\u0435\u0440\u0436\u043a\u0438 \u043f\u0440\u0438 \u0440\u0430\u0431\u043e\u0442\u0435 fdmon (file descriptor monitoring) \u0432 \u0440\u0435\u0436\u0438\u043c\u0435 &quot;aio=io_uring&quot; \u0438 \u043d\u0430\u0445\u043e\u0436\u0434\u0435\u043d\u0438\u0438 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0432 \u0441\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0438 \u043f\u0440\u043e\u0441\u0442\u043e\u044f (idle). \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u043b\u0430\u0441\u044c \u0438\u0437-\u0437\u0430 \u043f\u0435\u0440\u0435\u0432\u043e\u0434\u0430 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438 ppoll() \u0432 \u0441\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0438 \u0441\u043d\u0430 \u0441 \u0442\u0430\u0439\u043c\u0430\u0443\u0442\u043e\u043c 499\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Erik Peterson\"\/>\n\t<link rel=\"canonical\" href=\"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/razrabotchik-io_uring-vyyavil-v-qemu-problemu-v-50-80-raz-zamedlyavshuyu-fdmon-v-rezhime-prostoya\" \/>\n\t<meta name=\"generator\" content=\"All in One SEO (AIOSEO) 4.9.10\" \/>\n\t\t<meta property=\"og:locale\" content=\"it_IT\" \/>\n\t\t<meta property=\"og:site_name\" content=\"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b\" \/>\n\t\t<meta property=\"og:type\" content=\"article\" \/>\n\t\t<meta property=\"og:title\" content=\"\ud83e\udd47\u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a io_uring \u0432\u044b\u044f\u0432\u0438\u043b \u0432 QEMU \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0443, \u0432 50-80 \u0440\u0430\u0437 \u0437\u0430\u043c\u0435\u0434\u043b\u044f\u0432\u0448\u0443\u044e fdmon \u0432 \u0440\u0435\u0436\u0438\u043c\u0435 \u043f\u0440\u043e\u0441\u0442\u043e\u044f | ProHoster\" \/>\n\t\t<meta property=\"og:description\" content=\"\u0419\u0435\u043d\u0441 \u042d\u043a\u0441\u0431\u043e (Jens Axboe), \u0441\u043e\u0437\u0434\u0430\u0442\u0435\u043b\u044c io_uring \u0438 \u043f\u043b\u0430\u043d\u0438\u0440\u043e\u0432\u0449\u0438\u043a\u043e\u0432 \u0432\u0432\u043e\u0434\u0430\/\u0432\u044b\u0432\u043e\u0434\u0430 CFQ, Deadline \u0438 Noop, \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0438\u043b \u0434\u043b\u044f \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044f \u0432 \u043a\u043e\u0434\u043e\u0432\u0443\u044e \u0431\u0430\u0437\u0443 \u044d\u043c\u0443\u043b\u044f\u0442\u043e\u0440\u0430 QEMU \u043f\u0430\u0442\u0447, \u0432 50-80 \u0440\u0430\u0437 \u0441\u043e\u043a\u0440\u0430\u0449\u0430\u044e\u0449\u0438\u0439 \u0437\u0430\u0434\u0435\u0440\u0436\u043a\u0438 \u043f\u0440\u0438 \u0440\u0430\u0431\u043e\u0442\u0435 fdmon (file descriptor monitoring) \u0432 \u0440\u0435\u0436\u0438\u043c\u0435 &quot;aio=io_uring&quot; \u0438 \u043d\u0430\u0445\u043e\u0436\u0434\u0435\u043d\u0438\u0438 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0432 \u0441\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0438 \u043f\u0440\u043e\u0441\u0442\u043e\u044f (idle). \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u043b\u0430\u0441\u044c \u0438\u0437-\u0437\u0430 \u043f\u0435\u0440\u0435\u0432\u043e\u0434\u0430 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438 ppoll() \u0432 \u0441\u043e\u0441\u0442\u043e\u044f\u043d\u0438\u0438 \u0441\u043d\u0430 \u0441 \u0442\u0430\u0439\u043c\u0430\u0443\u0442\u043e\u043c 499\" \/>\n\t\t<meta property=\"og:url\" content=\"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/razrabotchik-io_uring-vyyavil-v-qemu-problemu-v-50-80-raz-zamedlyavshuyu-fdmon-v-rezhime-prostoya\" \/>\n\t\t<meta property=\"og:image\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta property=\"og:image:secure_url\" content=\"https:\/\/prohoster.info\/wp-content\/uploads\/2021\/11\/logo-350.jpg\" \/>\n\t\t<meta property=\"og:image:width\" content=\"350\" \/>\n\t\t<meta property=\"og:image:height\" content=\"350\" \/>\n\t\t<meta property=\"article:published_time\" content=\"2026-02-20T15:11:55+00:00\" \/>\n\t\t<meta property=\"article:modified_time\" content=\"2026-02-20T15:11:55+00:00\" \/>\n\t\t<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/prohoster\" \/>\n\t\t<!-- All in One SEO -->\n\n","aioseo_head_json":{"title":"\ud83e\udd47Lo sviluppatore di io_uring ha identificato un problema in QEMU che rallentava fdmon in stato di inattivit\u00e0 da 50 a 80 volte | ProHoster","description":"Jens Axboe, creatore di io_uring e degli scheduler di input\/output CFQ, Deadline e Noop, ha proposto di includere nella base di codice di QEMU una patch che riduce le latenze durante l'utilizzo di fdmon (monitoraggio dei file descriptor) in modalit\u00e0 \"aio=io_uring\" e quando il sistema \u00e8 in stato di inattivit\u00e0 (idle) da 50 a 80 volte. Il problema si manifestava a causa della traslazione dell'operazione ppoll() in uno stato di sonno con un timeout di 499","canonical_url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/razrabotchik-io_uring-vyyavil-v-qemu-problemu-v-50-80-raz-zamedlyavshuyu-fdmon-v-rezhime-prostoya","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"it_IT","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a io_uring \u0432\u044b\u044f\u0432\u0438\u043b \u0432 QEMU \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0443, \u0432 50-80 \u0440\u0430\u0437 \u0437\u0430\u043c\u0435\u0434\u043b\u044f\u0432\u0448\u0443\u044e fdmon \u0432 \u0440\u0435\u0436\u0438\u043c\u0435 \u043f\u0440\u043e\u0441\u0442\u043e\u044f | ProHoster","og:description":"\u0419\u0435\u043d\u0441 \u042d\u043a\u0441\u0431\u043e (Jens Axboe), \u0441\u043e\u0437\u0434\u0430\u0442\u0435\u043b\u044c io_uring \u0438 \u043f\u043b\u0430\u043d\u0438\u0440\u043e\u0432\u0449\u0438\u043a\u043e\u0432 \u0432\u0432\u043e\u0434\u0430\/\u0432\u044b\u0432\u043e\u0434\u0430 CFQ, Deadline \u0438 Noop, \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0438\u043b \u0434\u043b\u044f \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044f \u0432 \u043a\u043e\u0434\u043e\u0432\u0443\u044e \u0431\u0430\u0437\u0443 \u044d\u043c\u0443\u043b\u044f\u0442\u043e\u0440\u0430 QEMU \u043f\u0430\u0442\u0447, \u0432 50-80 \u0440\u0430\u0437 \u0441\u043e\u043a\u0440\u0430\u0449\u0430\u044e\u0449\u0438\u0439 \u0437\u0430\u0434\u0435\u0440\u0436\u043a\u0438 \u043f\u0440\u0438 \u0440\u0430\u0431\u043e\u0442\u0435 fdmon (file descriptor monitoring) \u0432 \u0440\u0435\u0436\u0438\u043c\u0435 &quot;aio=io_uring&quot; 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