{"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\/da\/blog\/news\/seryoznoe-snizhenie-proizvoditelnosti-yadra-5-19-vyzvannoe-zashhitoj-ot-ataki-retbleed","title":{"rendered":"Betydelig ydelsesreduktion i kernen 5.19, for\u00e5rsaget af beskyttelse mod Retbleed-angreb.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

En ingeni\u00f8r fra VMware har gjort udviklingssamfundet for Linux-kernen opm\u00e6rksom p\u00e5 et betydeligt fald i ydeevnen ved brug af Linux-kernen 5.19. Test af en virtuel maskine med kernen 5.19 i VMware ESXi-hypervisorens milj\u00f8 viste et fald i beregningsydelsen p\u00e5 70%, netv\u00e6rksoperationer p\u00e5 30% og opgaver relateret til lagring p\u00e5 13%, sammenlignet med den samme konfiguration med kernen 5.18. <\/p>\n

\u00c5rsagen til faldet i ydeevne angives som en \u00e6ndring i beskyttelseskoden mod angreb af typen Spectre v2 (spectre_v2=ibrs), implementeret p\u00e5 basis af udvidede instruktioner IBRS (Enhanced Indirect Branch Restricted Speculation), der tillader adaptiv tilladelse og forbud mod spekulativ udf\u00f8relse af instruktioner under behandling af afbrydelser, systemopkald og kontekstskift. Beskyttelsen er aktiveret for at blokere den nyligt opdagede s\u00e5rbarhed Retbleed i mekanismen for spekulativ udf\u00f8relse af indirekte overgange i CPU'en, som muligg\u00f8r udtr\u00e6kning af information fra kernens hukommelse eller organiseringen af et angreb p\u00e5 v\u00e6rtsystemet. virtual machines<\/a>. Efter deaktivering af beskyttelsen (spectre_v2=off) vender ydeevnen tilbage til tidligere niveauer.
\n
Kilde: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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\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\udd47Alvorligt fald i ydeevnen for kernen 5.19, for\u00e5rsaget af beskyttelsen mod angreb Retbleed | ProHoster","description":"En ingeni\u00f8r fra VMware har gjort udviklingssamfundet for Linux-kernen opm\u00e6rksom p\u00e5 et betydeligt fald i ydeevnen ved brug af Linux-kernen 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