{"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\/sq\/blog\/news\/razrabotchik-io_uring-vyyavil-v-qemu-problemu-v-50-80-raz-zamedlyavshuyu-fdmon-v-rezhime-prostoya","title":{"rendered":"Zhvilluesi i io_uring ka identifikuar nj\u00eb problem n\u00eb QEMU, q\u00eb ka ngadal\u00ebsuar fdmon nga 50-80 her\u00eb n\u00eb modalitetin e pritjes","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Jens Axboe, the creator of io_uring and the CFQ, Deadline, and Noop I\/O schedulers, proposed a patch for inclusion in the QEMU emulator codebase that reduces latency during fdmon (file descriptor monitoring) in «aio=io_uring» mode by 50-80 times, especially when the system is idle. <\/p>\n

Problemi shfaqej p\u00ebr shkak t\u00eb kalimit t\u00eb operacionit ppoll() n\u00eb gjendjen e flijimit me nj\u00eb koh\u00ebmat\u00ebs prej 499 ms, megjith\u00ebse kishte hyrje\/dalje. P\u00ebr t\u00eb rinisur kryerjen e ciklit kryesor t\u00eb trajtimit t\u00eb ngjarjeve, i pezulluar p\u00ebr shkak t\u00eb ppoll(), u propozua nj\u00eb patch q\u00eb shton n\u00eb funksionin e krijimit t\u00eb regjistrit SQE (Submission Queue Entry) thirrjen e funksionit aio_notify(), e cila ngre ppoll() nga gjendja e flijimit. <\/p>\n

Problemi u shfaq gjat\u00eb testimit regresiv t\u00eb io_uring n\u00eb makina virtuale<\/a> with various block devices. Jens noted the sporadic appearance of timeouts when using AHCI\/SATA devices in «aio=io_uring» mode, whereas configurations with virtio-blk or NVMe devices always completed tests successfully in about a second. It\u2019s worth noting that the issue affects all types of block devices, but delays are most pronounced for AHCI\/SATA devices due to the use of MMIO. <\/p>\n

Jens gjithashtu p\u00ebrshkroi p\u00ebrvoj\u00ebn e tij t\u00eb debuggimit t\u00eb problemit duke p\u00ebrdorur asistentin AI Claude. Pas p\u00ebrcaktimit t\u00eb skenarit q\u00eb riprodhon kushtet p\u00ebr shfaqjen e koh\u00ebmat\u00ebsit, ai i d\u00ebrgoi t\u00eb dh\u00ebnat e disponueshme t\u00eb debuggimit Claude, ofroi akses n\u00eb makin\u00ebn virtuale dhe sugjeroi t\u00eb p\u00ebrcaktonte shkaqet e mundshme t\u00eb gabimit t\u00eb identifikuar. <\/p>\n

Claude decided to check whether performance would degrade when using a virtio-blk device and ran a destructive scenario suggested by the developer that reproduced the problem. During the test, the first 128 MB of content from the block device \/dev\/vda in the virtual machine was deleted. After that, Claude concluded that the issue wasn\u2019t with virtio-blk. When Jens pointed out to the AI assistant the deletion of part of the content from \/dev\/vda, it responded, «Yes, I did that», and after being asked to fix it \u2014 restored the functionality of the virtual disk \/dev\/vda. It is noted that using the AI assistant helped to better understand the peculiarities of various event processing cycles in QEMU. <\/p>\n

\u00cbsht e r\u00ebnd\u00ebsishme t\u00eb theksohet se problemi ishte mjaft i v\u00ebshtir\u00eb p\u00ebr t'u zbuluar, pasi n\u00eb testet sintetike ngadal\u00ebsimi nuk regjistrohet p\u00ebr shkak se ndodhte ndikimi i zgjedhjes s\u00eb ciklit t\u00eb trajtimit t\u00eb ngjarjeve me ppoll nga aktivitete t\u00eb tjera, nd\u00ebrsa testet sintetike t\u00eb hyrjes\/jeshjes nuk kryejn\u00eb procesimin e t\u00eb dh\u00ebnave t\u00eb marra. Ngadal\u00ebsimi u b\u00eb m\u00eb i duksh\u00ebm me shtimin e disa thirrjeve usleep() p\u00ebr t\u00eb simuluar procesimin e t\u00eb dh\u00ebnave. <\/p>\n

Pas korrigjimit n\u00eb sistemin n\u00eb gjendje idle: time sudo .\/iotest \/dev\/sda U ekzekutua n\u00eb 25.76 sekonda fish external usr time 6.19 millis 783.00 micros 5.41 millis sys time 12.43 millis 642.00 micros 11.79 millis <\/p>\n

Pas korrigjimit n\u00eb sistemin n\u00eb gjendje idle: time sudo .\/iotest \/dev\/sda U ekzekutua n\u00eb 1.30 sekonda fish external usr time 2.14 millis 0.14 millis 2.00 millis sys time 16.93 millis 1.16 millis 15.76 millis
\n
Burimi: 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\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\udd47Zhvilluesi i io_uring identifikoi nj\u00eb problem n\u00eb QEMU, i cili ngadal\u00ebsonte fdmon n\u00eb m\u00ebnyr\u00eb idle nga 50-80 her\u00eb | ProHoster","description":"Jens Axboe, krijuesi i io_uring dhe planifikuesve t\u00eb hyrjes\/jeshjes CFQ, Deadline dhe Noop, propozoi p\u00ebrfshirjen n\u00eb kodin e baz\u00ebs s\u00eb emulatorit QEMU nj\u00eb patch, q\u00eb redukton vonesat gjat\u00eb pun\u00ebs n\u00eb fdmon nga 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