{"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\/fr\/blog\/news\/seryoznoe-snizhenie-proizvoditelnosti-yadra-5-19-vyzvannoe-zashhitoj-ot-ataki-retbleed","title":{"rendered":"Une grave r\u00e9duction de la performance du noyau 5.19, caus\u00e9e par une protection contre l'attaque Retbleed.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Un ing\u00e9nieur de VMware a attir\u00e9 l'attention de la communaut\u00e9 des d\u00e9veloppeurs du noyau Linux sur une diminution significative des performances lors de l'utilisation du noyau Linux 5.19. Les tests d'une machine virtuelle avec le noyau 5.19 dans un environnement hyperviseur VMware ESXi ont montr\u00e9 une r\u00e9duction des performances de calcul de 70 %, des op\u00e9rations r\u00e9seau de 30 % et des actions de stockage de 13 %, par rapport \u00e0 la m\u00eame configuration utilisant le noyau 5.18. <\/p>\n

La raison de la diminution des performances est attribu\u00e9e \u00e0 un changement dans le code de protection contre les attaques de la classe Spectre v2 (spectre_v2=ibrs), impl\u00e9ment\u00e9 sur la base d'instructions \u00e9tendues IBRS (Enhanced Indirect Branch Restricted Speculation), permettant de g\u00e9rer adaptativement l'autorisation et l'interdiction de l'ex\u00e9cution sp\u00e9culative des instructions pendant le traitement des interruptions, des appels syst\u00e8me et des changements de contexte. Cette protection est activ\u00e9e pour bloquer la vuln\u00e9rabilit\u00e9 r\u00e9cemment d\u00e9couverte Retbleed dans le m\u00e9canisme d'ex\u00e9cution sp\u00e9culative des branches indirectes du CPU, permettant d'extraire des informations de la m\u00e9moire du noyau ou d'organiser une attaque contre le syst\u00e8me h\u00f4te \u00e0 partir de machines virtuelles<\/a>. Apr\u00e8s la d\u00e9sactivation de la protection (spectre_v2=off), les performances reviennent \u00e0 leur niveau pr\u00e9c\u00e9dent.
\n
Source : opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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[…]<\/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\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\udd47Diminution s\u00e9rieuse des performances du noyau 5.19, caus\u00e9e par la protection contre l'attaque Retbleed | ProHoster","description":"Un ing\u00e9nieur de VMware a attir\u00e9 l'attention de la communaut\u00e9 des d\u00e9veloppeurs du noyau Linux sur une diminution significative des performances lors de l'utilisation du noyau Linux 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