{"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\/sv\/blog\/news\/razrabotchik-io_uring-vyyavil-v-qemu-problemu-v-50-80-raz-zamedlyavshuyu-fdmon-v-rezhime-prostoya","title":{"rendered":"Utvecklaren io_uring uppt\u00e4ckte ett problem i QEMU som saktade ner fdmon med 50-80 g\u00e5nger i vilol\u00e4ge.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

\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 «aio=io_uring» \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). <\/p>\n

Problemet uppstod p\u00e5 grund av \u00f6verg\u00e5ngen av ppoll()-operationen till vilol\u00e4ge med en timeout p\u00e5 499 ms, trots att det fanns I\/O. F\u00f6r att \u00e5teruppta k\u00f6rningen av h\u00e4ndelsebehandlingscykeln, som pausades p\u00e5 grund av ppoll(), f\u00f6reslogs en patch som l\u00e4gger till ett anrop av funktionen aio_notify() i funktionen f\u00f6r att skapa en SQE (Submission Queue Entry) post. <\/p>\n

Problemet d\u00f6k upp under regressionstestning av io_uring i virtuella maskiner<\/a> c \u0440\u0430\u0437\u043d\u044b\u043c\u0438 \u0431\u043b\u043e\u0447\u043d\u044b\u043c\u0438 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430\u043c\u0438. \u0419\u0435\u043d\u0441 \u043e\u0431\u0440\u0430\u0442\u0438\u043b \u0432\u043d\u0438\u043c\u0430\u043d\u0438\u0435 \u043d\u0430 \u0441\u043b\u0443\u0447\u0430\u0439\u043d\u043e\u0435 \u043f\u043e\u044f\u0432\u043b\u0435\u043d\u0438\u0435 \u0442\u0430\u0439\u043c\u0430\u0443\u0442\u043e\u0432 \u043f\u0440\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 AHCI\/SATA-\u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432 \u0432 \u0440\u0435\u0436\u0438\u043c\u0435 «aio=io_uring», \u0432 \u0442\u043e \u0432\u0440\u0435\u043c\u044f \u043a\u0430\u043a \u0432 \u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0446\u0438\u044f\u0445 \u0441 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430\u043c\u0438 virtio-blk \u0438\u043b\u0438 nvme \u0442\u0435\u0441\u0442\u044b \u0432\u0441\u0435\u0433\u0434\u0430 \u0443\u0441\u043f\u0435\u0448\u043d\u043e \u0437\u0430\u0432\u0435\u0440\u0448\u0430\u043b\u0438\u0441\u044c \u043f\u0440\u0438\u043c\u0435\u0440\u043d\u043e \u0437\u0430 \u0441\u0435\u043a\u0443\u043d\u0434\u0443. \u041f\u0440\u0438 \u044d\u0442\u043e\u043c \u043e\u0442\u043c\u0435\u0447\u0430\u0435\u0442\u0441\u044f, \u0447\u0442\u043e \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0437\u0430\u0442\u0440\u0430\u0433\u0438\u0432\u0430\u0435\u0442 \u0432\u0441\u0435 \u0442\u0438\u043f\u044b \u0431\u043b\u043e\u0447\u043d\u044b\u0445 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432, \u043d\u043e \u0434\u043b\u044f \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432 AHCI\/SATA \u043f\u043e\u044f\u0432\u043b\u0435\u043d\u0438\u0435 \u0437\u0430\u0434\u0435\u0440\u0436\u0435\u043a \u043d\u0430\u0438\u0431\u043e\u043b\u0435\u0435 \u044f\u0440\u043a\u043e \u0432\u044b\u0440\u0430\u0436\u0435\u043d\u043e \u0438\u0437-\u0437\u0430 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044f MMIO. <\/p>\n

Jens beskrev ocks\u00e5 sin erfarenhet av att fels\u00f6ka problemet med hj\u00e4lp av AI-assistenten Claude. Efter att ha definierat ett scenario som \u00e5terskapade f\u00f6rh\u00e5llandena f\u00f6r att orsaka timeouten, \u00f6verl\u00e4mnade han de befintliga fels\u00f6kningsdata till Claude, gav tillg\u00e5ng till den virtuella maskinen och f\u00f6reslog att identifiera de troliga orsakerna till det uppt\u00e4ckta felet. <\/p>\n

Claude \u0440\u0435\u0448\u0438\u043b \u043f\u0440\u043e\u0432\u0435\u0440\u0438\u0442\u044c \u0437\u0430\u043c\u0435\u0434\u043b\u0438\u0442\u0441\u044f \u043b\u0438 \u0440\u0430\u0431\u043e\u0442\u0430 \u043f\u0440\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430 virtio-blk \u0438 \u0437\u0430\u043f\u0443\u0441\u0442\u0438\u043b \u0441 \u043d\u0438\u043c \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u043d\u044b\u0439 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u043e\u043c \u0434\u0435\u0441\u0442\u0440\u0443\u043a\u0442\u0438\u0432\u043d\u044b\u0439 \u0441\u0446\u0435\u043d\u0430\u0440\u0438\u0439, \u0432\u043e\u0441\u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u044f\u0449\u0438\u0439 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0443. \u0412 \u0445\u043e\u0434\u0435 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u0431\u044b\u043b\u0438 \u0443\u0434\u0430\u043b\u0435\u043d\u044b \u043f\u0435\u0440\u0432\u044b\u0435 128 \u041c\u0411 \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0433\u043e \u0438\u0437 \u0431\u043b\u043e\u0447\u043d\u043e\u0433\u043e \u0443\u0441\u0442\u0440\u043e\u0439\u0441\u0442\u0432\u0430 \/dev\/vda \u0432 \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u044c\u043d\u043e\u0439 \u043c\u0430\u0448\u0438\u043d\u0435. \u041f\u043e\u0441\u043b\u0435 \u044d\u0442\u043e\u0433\u043e, Claud \u0441\u0434\u0435\u043b\u0430\u043b \u0432\u044b\u0432\u043e\u0434, \u0447\u0442\u043e \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u043d\u0435 \u0432 virtio-blk. \u041a\u043e\u0433\u0434\u0430 \u0419\u0435\u043d\u0441 \u0443\u043a\u0430\u0437\u0430\u043b AI-\u0430\u0441\u0441\u0438\u0441\u0442\u0435\u043d\u0442\u0443 \u043d\u0430 \u0443\u0434\u0430\u043b\u0435\u043d\u0438\u0435 \u0447\u0430\u0441\u0442\u0438 \u0441\u043e\u0434\u0435\u0440\u0436\u0438\u043c\u043e\u0433\u043e \/dev\/vda, \u043e\u043d \u043e\u0442\u0432\u0435\u0442\u0438\u043b «\u0414\u0430, \u044f \u0441\u0434\u0435\u043b\u0430\u043b \u044d\u0442\u043e», \u0430 \u043f\u043e\u0441\u043b\u0435 \u043f\u0440\u043e\u0441\u044c\u0431\u044b \u0438\u0441\u043f\u0440\u0430\u0432\u0438\u0442\u044c — \u0432\u043e\u0441\u0441\u0442\u0430\u043d\u043e\u0432\u0438\u043b \u0440\u0430\u0431\u043e\u0442\u043e\u0441\u043f\u043e\u0441\u043e\u0431\u043d\u043e\u0441\u0442\u044c \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u044c\u043d\u043e\u0433\u043e \u0434\u0438\u0441\u043a\u0430 \/dev\/vda. \u041e\u0442\u043c\u0435\u0447\u0430\u0435\u0442\u0441\u044f, \u0447\u0442\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0435 AI-\u0430\u0441\u0441\u0438\u0441\u0442\u0435\u043d\u0442\u0430 \u043f\u043e\u043c\u043e\u0433\u043b\u043e \u043b\u0443\u0447\u0448\u0435 \u043f\u043e\u043d\u044f\u0442\u044c \u043e\u0441\u043e\u0431\u0435\u043d\u043d\u043e\u0441\u0442\u0438 \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u0440\u0430\u0437\u043b\u0438\u0447\u043d\u044b\u0445 \u0446\u0438\u043a\u043b\u043e\u0432 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u0441\u043e\u0431\u044b\u0442\u0438\u0439 \u0432 QEMU. <\/p>\n

Det \u00e4r anm\u00e4rkningsv\u00e4rt att problemet var ganska sv\u00e5rt att uppt\u00e4cka, eftersom f\u00f6rdr\u00f6jningen inte registrerades i syntetiska tester p\u00e5 grund av att ett felaktigt v\u00e4ckande av h\u00e4ndelseloopen med ppoll p\u00e5verkades av annan aktivitet, och syntetiska I\/O-tester utf\u00f6r inte bearbetning av mottagna data. F\u00f6rdr\u00f6jningen blev mer m\u00e4rkbar vid tillsats av flera anrop av usleep() f\u00f6r att simulera databehandling. <\/p>\n

F\u00f6re fixeringen i systemets vilol\u00e4ge (idle): time sudo .\/iotest \/dev\/sda Utf\u00f6rd p\u00e5 25,76 sekunder fish extern usr tid 6,19 millis 783,00 micros 5,41 millis sys tid 12,43 millis 642,00 micros 11,79 millis <\/p>\n

Efter fixeringen i systemets vilol\u00e4ge: time sudo .\/iotest \/dev\/sda Utf\u00f6rd p\u00e5 1,30 sekunder fish extern usr tid 2,14 millis 0,14 millis 2,00 millis sys tid 16,93 millis 1,16 millis 15,76 millis
\n
K\u00e4lla: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\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 «aio=io_uring» \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 […]<\/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-news"],"aioseo_notices":[],"aioseo_head":"\n\t\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\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Utvecklare av io_uring identifierade ett problem i QEMU som s\u00e4nkte fdmon i vilol\u00e4ge med 50-80 g\u00e5nger | ProHoster","description":"Jens Axboe, skaparen av io_uring och schemal\u00e4ggarna f\u00f6r I\/O CFQ, Deadline och Noop, f\u00f6reslog en patch f\u00f6r inkludering i QEMU emulatorns kodbas, som minskar f\u00f6rdr\u00f6jningarna vid fdmon-arbete med 50-80 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