{"id":105072,"date":"2022-09-12T15:37:54","date_gmt":"2022-09-12T13:37:54","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/seryoznoe-snizhenie-proizvoditelnosti-yadra-5-19-vyzvannoe-zashhitoj-ot-ataki-retbleed"},"modified":"2022-09-12T15:37:54","modified_gmt":"2022-09-12T13:37:54","slug":"seryoznoe-snizhenie-proizvoditelnosti-yadra-5-19-vyzvannoe-zashhitoj-ot-ataki-retbleed","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sv\/blog\/news\/seryoznoe-snizhenie-proizvoditelnosti-yadra-5-19-vyzvannoe-zashhitoj-ot-ataki-retbleed","title":{"rendered":"Significant performance decline of kernel 5.19 caused by protection against the Retbleed attack","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

En ingenj\u00f6r fr\u00e5n VMware har uppm\u00e4rksammat Linux-k\u00e4rnutvecklarnas gemenskap p\u00e5 en betydande minskning av prestandan vid anv\u00e4ndning av k\u00e4rnan Linux 5.19. Testning av en virtuell maskin med k\u00e4rnan 5.19 i VMware ESXi-hypervisorn visade p\u00e5 en minskning av ber\u00e4kningsprestandan med 70 %, n\u00e4tverksoperationer med 30 % och lagrings\u00e5tg\u00e4rder med 13 % j\u00e4mf\u00f6rt med samma konfiguration baserad p\u00e5 k\u00e4rnan 5.18. <\/p>\n

Som orsak till prestandafallet n\u00e4mns en f\u00f6r\u00e4ndring i koden f\u00f6r skydd mot Spectre v2-attacker (spectre_v2=ibrs), implementerad baserat p\u00e5 de ut\u00f6kade IBRS-instruktionerna (Enhanced Indirect Branch Restricted Speculation), som g\u00f6r det m\u00f6jligt att dynamiskt till\u00e5ta och f\u00f6rbjuda spekulativ exekvering av instruktioner under hantering av avbrott, systemanrop och kontextbyten. Skyddet \u00e4r aktiverat f\u00f6r att blockera en nyligen identifierad s\u00e5rbarhet, Retbleed, i mekanismen f\u00f6r spekulativ exekvering av indirekta grenar i CPU, vilket m\u00f6jligg\u00f6r extrahering av information fr\u00e5n k\u00e4rnminnet eller organisering av en attack mot v\u00e4rdsystemet fr\u00e5n virtuella maskiner<\/a>. N\u00e4r skyddet inaktiveras (spectre_v2=off) \u00e5terg\u00e5r prestandan till den tidigare niv\u00e5n.
\n
K\u00e4lla: 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 VMware \u043e\u0431\u0440\u0430\u0442\u0438\u043b \u0432\u043d\u0438\u043c\u0430\u043d\u0438\u0435 \u0441\u043e\u043e\u0431\u0449\u0435\u0441\u0442\u0432\u0430 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u043e\u0432 \u044f\u0434\u0440\u0430 Linux \u043d\u0430 \u0437\u043d\u0430\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0435 \u0441\u043d\u0438\u0436\u0435\u043d\u0438\u0435 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438, \u043f\u0440\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 \u044f\u0434\u0440\u0430 Linux 5.19. \u0422\u0435\u0441\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u044c\u043d\u043e\u0439 \u043c\u0430\u0448\u0438\u043d\u044b \u0441 \u044f\u0434\u0440\u043e\u043c 5.19 \u0432 \u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u0438 \u0433\u0438\u043f\u0435\u0440\u0432\u0438\u0437\u043e\u0440\u0430 VMware ESXi \u043f\u043e\u043a\u0430\u0437\u0430\u043b\u043e \u0441\u043d\u0438\u0436\u0435\u043d\u0438\u0435 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u0432\u044b\u0447\u0438\u0441\u043b\u0435\u043d\u0438\u0439 \u043d\u0430 70%, \u0441\u0435\u0442\u0435\u0432\u044b\u0445 \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0439 \u043d\u0430 30% \u0438 \u0434\u0435\u0439\u0441\u0442\u0432\u0438\u0439 \u0441 \u0445\u0440\u0430\u043d\u0438\u043b\u0438\u0449\u0435\u043c \u043d\u0430 13%, \u043f\u043e \u0441\u0440\u0430\u0432\u043d\u0435\u043d\u0438\u044e \u0441 \u0442\u043e\u0439 \u0436\u0435 \u043a\u043e\u043d\u0444\u0438\u0433\u0443\u0440\u0430\u0446\u0438\u0435\u0439 \u043d\u0430 \u0431\u0430\u0437\u0435 \u044f\u0434\u0440\u0430 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-105072","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\udd47Betydande prestandafall f\u00f6r k\u00e4rnan 5.19, orsakad av skyddet mot Retbleed-attacken | ProHoster","description":"En ingenj\u00f6r fr\u00e5n VMware har uppm\u00e4rksammat Linux-k\u00e4rnutvecklarnas gemenskap p\u00e5 en betydande minskning av prestandan vid anv\u00e4ndning av k\u00e4rnan Linux 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