{"id":120994,"date":"2024-12-16T15:46:10","date_gmt":"2024-12-16T13:46:10","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/kvm-regressii-proizvoditelnosti-i-obsuzhdenie-podderzhki-32-razryadnyh-sistem"},"modified":"2024-12-16T15:46:10","modified_gmt":"2024-12-16T13:46:10","slug":"kvm-regressii-proizvoditelnosti-i-obsuzhdenie-podderzhki-32-razryadnyh-sistem","status":"publish","type":"post","link":"https:\/\/prohoster.info\/es\/blog\/news\/kvm-regressii-proizvoditelnosti-i-obsuzhdenie-podderzhki-32-razryadnyh-sistem","title":{"rendered":"KVM: regresiones de rendimiento y discusi\u00f3n sobre el soporte de sistemas de 32 bits","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

El n\u00facleo de Linux 6.13-rc3 incluye un cambio que elimina una regresi\u00f3n en el rendimiento del hipervisor KVM, relacionada con el lento manejo de las llamadas CPUID en nuevas CPU, por ejemplo, en las CPU Intel Emerald Rapids, las operaciones con CPUID se realizan de 3 a 4 veces m\u00e1s lentamente que en las CPU Intel Skylake. Esta particularidad ha llevado a una disminuci\u00f3n en el rendimiento del hipervisor KVM, que utiliza CPUID en el proceso de guardar y restaurar el estado del procesador en cada cambio de control a la m\u00e1quina virtual, en caso de utilizar virtualizaci\u00f3n anidada. Para resolver el problema, se ha aceptado un parche reducido en la rama del n\u00facleo 6.13, que permite reducir el tiempo de operaci\u00f3n hasta en un 40% incluso en CPU de la familia SkyLake, gracias al almacenamiento en cach\u00e9 de CPUID. En el n\u00facleo 6.14 se presentar\u00e1 la versi\u00f3n completa del parche, que mejora a\u00fan m\u00e1s el rendimiento. <\/p>\n

Adem\u00e1s, se puede mencionar la discusi\u00f3n en la lista de correo de los desarrolladores del n\u00facleo de Linux sobre la finalizaci\u00f3n del soporte para sistemas de 32 bits en el hipervisor. KVM<\/a>. Inicialmente, se propuso un parche para el n\u00facleo que eliminaba el soporte de virtualizaci\u00f3n KVM en la plataforma x86-32. En respuesta, se expresaron preocupaciones de que el soporte para x86-32 podr\u00eda ser \u00fatil para realizar pruebas del modo de host en general en sistemas de 32 bits, ya que en el n\u00facleo, adem\u00e1s de x86-32, quedan otras tres arquitecturas de 32 bits soportadas en KVM. En respuesta, se present\u00f3 otro parche, esta vez eliminando el soporte de KVM para todos los sistemas de 32 bits. <\/p>\n

El deseo de deshacerse del soporte para sistemas de 32 bits se explica porque incluso en los procesadores de 32 bits ARM m\u00e1s comunes, como ARM Cortex A7, la virtualizaci\u00f3n no ha tenido desarrollo ni uso. m\u00e1quinas virtuales<\/a> en sistemas ARM de 32 bits era tan raro que el soporte de dichos sistemas en KVM se elimin\u00f3 en 2020, y eso no provoc\u00f3 objeciones. Se se\u00f1ala que para los dem\u00e1s sistemas de 32 bits, los cambios solo afectar\u00e1n plataformas ex\u00f3ticas que no se utilizan desde hace mucho tiempo o que nunca han sido populares. Entre los procesadores que se ven afectados por el parche se encuentran: Intel Core Duo\/Silverthorne, PowerPC e300\/e500\/e600 y MIPS P5600. El parche se ha publicado como RFC, es decir, se ha sometido a discusi\u00f3n.
\n
Fuente: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\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 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