La version du noyau Linux 6.13-rc3 int\u00e8gre un changement visant \u00e0 \u00e9liminer une r\u00e9gression de performance dans l'hyperviseur KVM, li\u00e9e \u00e0 un traitement lent des appels CPUID sur les nouveaux CPU. Par exemple, sur les CPU Intel Emerald Rapids, les op\u00e9rations CPUID sont ex\u00e9cut\u00e9es 3 \u00e0 4 fois plus lentement que sur les CPU Intel Skylake. Cette particularit\u00e9 a conduit \u00e0 une baisse de performance de l'hyperviseur KVM, qui utilise CPUID lors de la sauvegarde et de la restauration de l'\u00e9tat du processeur \u00e0 chaque transition de contr\u00f4le vers la machine virtuelle, en cas de virtualisation imbriqu\u00e9e. Pour r\u00e9soudre ce probl\u00e8me, un correctif simplifi\u00e9 a \u00e9t\u00e9 int\u00e9gr\u00e9 dans la branche du noyau 6.13, permettant de r\u00e9duire le temps d'ex\u00e9cution jusqu'\u00e0 40 % m\u00eame sur les CPU de la famille Skylake, gr\u00e2ce \u00e0 la mise en cache de CPUID. Une version compl\u00e8te du correctif sera pr\u00e9sent\u00e9e dans le noyau 6.14, am\u00e9liorant encore la performance. <\/p>\n
En outre, on peut noter une discussion dans la liste de diffusion des d\u00e9veloppeurs du noyau Linux sur l'arr\u00eat du support des syst\u00e8mes 32 bits dans l'hyperviseur. KVM<\/a>Initialement, un correctif avait \u00e9t\u00e9 propos\u00e9 pour le noyau supprimant le support de la virtualisation KVM sur la plateforme x86-32. En r\u00e9ponse, des inqui\u00e9tudes ont \u00e9t\u00e9 exprim\u00e9es concernant l'utilit\u00e9 du support x86-32 pour tester le fonctionnement du mode h\u00f4te en g\u00e9n\u00e9ral sur des syst\u00e8mes 32 bits, car le noyau prend en charge en plus de x86-32 encore trois architectures 32 bits, support\u00e9es dans KVM. Un autre correctif a \u00e9t\u00e9 pr\u00e9sent\u00e9 en r\u00e9ponse, cette fois-ci supprimant du KVM le support de tous les syst\u00e8mes 32 bits. <\/p>\n Le d\u00e9sir d'\u00e9liminer le support des syst\u00e8mes 32 bits s'explique par le fait que m\u00eame sur des processeurs ARM 32 bits massivement utilis\u00e9s, tels que l'ARM Cortex A7, la virtualisation ne s'est pas d\u00e9velopp\u00e9e et son utilisation machines virtuelles<\/a> sur les syst\u00e8mes ARM 32 bits a \u00e9t\u00e9 si rare que le support de ces syst\u00e8mes dans KVM a \u00e9t\u00e9 supprim\u00e9 en 2020 sans susciter d'opposition. Il est not\u00e9 que pour les autres syst\u00e8mes 32 bits, les changements ne toucheront que des plateformes exotiques, qui ne sont plus utilis\u00e9es en pratique ou qui n'ont jamais \u00e9t\u00e9 populaires. Parmi les processeurs concern\u00e9s par le correctif figurent : Intel Core Duo\/Silverthorne, PowerPC e300\/e500\/e600 et MIPS P5600. Le correctif a \u00e9t\u00e9 publi\u00e9 en tant que RFC, c'est-\u00e0-dire pr\u00e9sent\u00e9 pour discussion. \u0412 \u0441\u043e\u0441\u0442\u0430\u0432 \u044f\u0434\u0440\u0430 Linux 6.13-rc3 \u043f\u0440\u0438\u043d\u044f\u0442\u043e \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u0435, \u0443\u0441\u0442\u0440\u0430\u043d\u044f\u044e\u0449\u0435\u0435 \u0440\u0435\u0433\u0440\u0435\u0441\u0441\u0438\u044e \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u0432 \u0433\u0438\u043f\u0435\u0440\u0432\u0438\u0437\u043e\u0440\u0435 KVM, \u0441\u0432\u044f\u0437\u0430\u043d\u043d\u0443\u044e \u0441 \u043c\u0435\u0434\u043b\u0435\u043d\u043d\u043e\u0439 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u043e\u0439 \u0432\u044b\u0437\u043e\u0432\u043e\u0432 CPUID \u043d\u0430 \u043d\u043e\u0432\u044b\u0445 CPU, \u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u043d\u0430 CPU Intel Emerald Rapids \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u0438 c CPUID \u0432\u044b\u043f\u043e\u043b\u043d\u044f\u044e\u0442\u0441\u044f \u0432 3-4 \u0440\u0430\u0437\u0430 \u043c\u0435\u0434\u043b\u0435\u043d\u043d\u0435\u0435, \u0447\u0435\u043c \u043d\u0430 CPU Intel Skylake. \u041f\u043e\u0434\u043e\u0431\u043d\u0430\u044f \u043e\u0441\u043e\u0431\u0435\u043d\u043d\u043e\u0441\u0442\u044c \u043f\u0440\u0438\u0432\u0435\u043b\u0430 \u043a \u0441\u043d\u0438\u0436\u0435\u043d\u0438\u044e \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u0433\u0438\u043f\u0435\u0440\u0432\u0438\u0437\u043e\u0440\u0430 KVM, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442 CPUID \u0432 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0435 \u0441\u043e\u0445\u0440\u0430\u043d\u0435\u043d\u0438\u044f […]<\/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-120994","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\udd47KVM : r\u00e9gressions de performance et discussion sur le support des syst\u00e8mes 32 bits | ProHoster","description":"La version du noyau Linux 6.13-rc3 int\u00e8gre un changement visant \u00e0 \u00e9liminer une r\u00e9gression de performance dans l'hyperviseur KVM, li\u00e9e \u00e0 un traitement lent des appels CPUID sur les nouveaux CPU, par exemple, sur les CPU Intel Emerald Rapids, les 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Source : opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"