A composi\u00e7\u00e3o do n\u00facleo do Linux 6.13-rc3 inclui uma altera\u00e7\u00e3o que corrige uma regress\u00e3o de desempenho no hipervisor KVM, relacionada ao processamento lento de chamadas CPUID em novos CPUs. Por exemplo, em CPUs Intel Emerald Rapids, as opera\u00e7\u00f5es com CPUID s\u00e3o realizadas de 3 a 4 vezes mais lentamente do que em CPUs Intel Skylake. Essa caracter\u00edstica levou \u00e0 diminui\u00e7\u00e3o do desempenho do hipervisor KVM, que utiliza CPUID no processo de salvar e restaurar o estado do processador em cada troca de controle para a m\u00e1quina virtual, caso a virtualiza\u00e7\u00e3o aninhada seja utilizada. Para resolver o problema, foi aceito um patch reduzido na ramifica\u00e7\u00e3o do n\u00facleo 6.13, permitindo uma redu\u00e7\u00e3o de at\u00e9 40% no tempo da opera\u00e7\u00e3o mesmo em CPUs da fam\u00edlia SkyLake, gra\u00e7as ao cache de CPUID. A vers\u00e3o completa do patch ser\u00e1 apresentada no n\u00facleo 6.14, melhorando ainda mais o desempenho. <\/p>\n
Al\u00e9m disso, \u00e9 poss\u00edvel notar a discuss\u00e3o na lista de distribui\u00e7\u00e3o dos desenvolvedores do n\u00facleo Linux sobre a interrup\u00e7\u00e3o do suporte a sistemas de 32 bits no hipervisor. KVM<\/a>. Inicialmente, foi proposto um patch para o n\u00facleo que remove o suporte \u00e0 virtualiza\u00e7\u00e3o KVM na plataforma x86-32. Em resposta, surgiram preocupa\u00e7\u00f5es de que o suporte a x86-32 poderia ser \u00fatil para testar o funcionamento do modo host de forma geral em sistemas de 32 bits, uma vez que no n\u00facleo, al\u00e9m do x86-32, ainda restam outras tr\u00eas arquiteturas de 32 bits suportadas pelo KVM. Em resposta, foi apresentado mais um patch, desta vez removendo do KVM o suporte a todos os sistemas de 32 bits. <\/p>\n O desejo de eliminar o suporte a sistemas de 32 bits \u00e9 explicado pelo fato de que mesmo em processadores ARM de 32 bits comuns, como o ARM Cortex A7, a virtualiza\u00e7\u00e3o n\u00e3o se desenvolveu e seu uso. m\u00e1quinas virtuais<\/a> em sistemas ARM de 32 bits era t\u00e3o raro que o suporte a esses sistemas no KVM foi removido em 2020 e isso n\u00e3o gerou obje\u00e7\u00f5es. \u00c9 observado que para os demais sistemas de 32 bits, as mudan\u00e7as afetar\u00e3o apenas plataformas ex\u00f3ticas que h\u00e1 muito n\u00e3o s\u00e3o utilizadas na pr\u00e1tica ou que nunca foram populares. Entre os processadores que o patch afeta est\u00e3o: Intel Core Duo\/Silverthorne, PowerPC e300\/e500\/e600 e MIPS P5600. O patch foi publicado como RFC, ou seja, foi submetido \u00e0 discuss\u00e3o. \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\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: regress\u00f5es de desempenho e discuss\u00e3o sobre suporte a sistemas de 32 bits | ProHoster","description":"A composi\u00e7\u00e3o do n\u00facleo do Linux 6.13-rc3 inclui uma altera\u00e7\u00e3o que corrige uma regress\u00e3o de desempenho no hipervisor KVM, relacionada ao processamento lento de chamadas CPUID em novos CPUs, como em CPUs Intel Emerald 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Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"