{"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\/es\/blog\/news\/seryoznoe-snizhenie-proizvoditelnosti-yadra-5-19-vyzvannoe-zashhitoj-ot-ataki-retbleed","title":{"rendered":"Importante disminuci\u00f3n en el rendimiento del n\u00facleo 5.19, causada por la protecci\u00f3n contra el ataque Retbleed","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Un ingeniero de VMware ha llamado la atenci\u00f3n de la comunidad de desarrolladores del n\u00facleo de Linux sobre una reducci\u00f3n significativa en el rendimiento al utilizar el n\u00facleo de Linux 5.19. Las pruebas de una m\u00e1quina virtual con el n\u00facleo 5.19 en el entorno del hipervisor VMware ESXi mostraron una disminuci\u00f3n del 70% en el rendimiento de c\u00e1lculos, del 30% en operaciones de red y del 13% en acciones de almacenamiento, en comparaci\u00f3n con la misma configuraci\u00f3n basada en el n\u00facleo 5.18. <\/p>\n

La causa de la disminuci\u00f3n del rendimiento se atribuye a un cambio en el c\u00f3digo de protecci\u00f3n contra ataques de la clase Spectre v2 (spectre_v2=ibrs), implementada a partir de instrucciones mejoradas IBRS (Enhanced Indirect Branch Restricted Speculation), que permiten autorizar y prohibir de manera adaptativa la ejecuci\u00f3n especulativa de instrucciones durante el manejo de interrupciones, llamadas al sistema y cambios de contexto. La protecci\u00f3n se ha habilitado para bloquear una vulnerabilidad recientemente descubierta, Retbleed, en el mecanismo de ejecuci\u00f3n especulativa de saltos indirectos de la CPU, que permite extraer informaci\u00f3n de la memoria del n\u00facleo o realizar un ataque en el sistema host. m\u00e1quinas virtuales<\/a>. Tras desactivar la protecci\u00f3n (spectre_v2=off), el rendimiento vuelve a su nivel anterior.
\n
Fuente: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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