Nel kernel Linux 6.13-rc3 \u00e8 stata introdotta una modifica che elimina una regressione delle prestazioni nel hypervisor KVM, legata a un'elaborazione lenta delle chiamate CPUID su nuovi CPU. Ad esempio, su CPU Intel Emerald Rapids, le operazioni con CPUID avvengono da 3 a 4 volte pi\u00f9 lentamente rispetto a CPU Intel Skylake. Questa caratteristica ha portato a un calo delle prestazioni dell'hypervisor KVM, che utilizza CPUID nel processo di salvataggio e ripristino dello stato del processore ad ogni passaggio di controllo alla macchina virtuale, nel caso venga utilizzata la virtualizzazione nidificata. Per risolvere il problema, \u00e8 stato accettato un patch ridotto nel ramo del kernel 6.13, permettendo di ridurre fino al 40% il tempo di operazione anche su CPU della famiglia Skylake, grazie alla cache CPUID. La versione completa del patch sar\u00e0 presentata nel kernel 6.14, migliorando ulteriormente le prestazioni. <\/p>\n
Inoltre, si segnala una discussione nella mailing list degli sviluppatori del kernel Linux riguardante la cessazione del supporto per i sistemi a 32 bit nell'hypervisor. KVM<\/a>. Inizialmente, \u00e8 stata proposta una patch per il kernel che rimuove il supporto per la virtualizzazione KVM sulla piattaforma x86-32. In risposta, sono state espresse preoccupazioni sul fatto che il supporto per x86-32 potrebbe essere utile per testare il funzionamento della modalit\u00e0 host in generale su sistemi a 32 bit, poich\u00e9 nel kernel, oltre a x86-32, rimangono altre tre architetture a 32 bit supportate in KVM. In risposta \u00e8 stata presentata un'altra patch, questa volta rimuovendo da KVM il supporto per tutti i sistemi a 32 bit. <\/p>\n Il desiderio di eliminare il supporto per i sistemi a 32 bit \u00e8 spiegato dal fatto che anche sui processori ARM a 32 bit pi\u00f9 diffusi, come l'ARM Cortex A7, la virtualizzazione non ha avuto sviluppo e utilizzo. di macchine virtuali<\/a> Sui sistemi a 32 bit ARM era cos\u00ec raro che il supporto per questi sistemi in KVM \u00e8 stato rimosso nel 2020 senza sollevare obiezioni. Si osserva che per gli altri sistemi a 32 bit le modifiche interesseranno solo piattaforme esotiche, che non sono pi\u00f9 utilizzate nella pratica o che non sono mai state popolari. Tra i processori toccati dalla patch ci sono: Intel Core Duo\/Silverthorne, PowerPC e300\/e500\/e600 e MIPS P5600. La patch \u00e8 stata pubblicata come RFC, ovvero \u00e8 stata sottoposta a discussione. \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-novosti-interneta"],"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: regressioni delle prestazioni e discussione sul supporto per i sistemi a 32 bit | ProHoster","description":"Il kernel Linux 6.13-rc3 ha ricevuto una modifica che risolve un regresso delle prestazioni nel hypervisor KVM, legato a una lenta gestione delle chiamate CPUID su nuove CPU. Ad esempio, sulle CPU Intel Emerald Rapids, le operazioni con CPUID vengono eseguite da 3 a 4 volte pi\u00f9 lentamente rispetto alle CPU Intel Skylake. Questa caratteristica ha portato a una diminuzione delle prestazioni dell'hypervisor KVM, il quale utilizza CPUID durante il processo di salvataggio.","canonical_url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/kvm-regressii-proizvoditelnosti-i-obsuzhdenie-podderzhki-32-razryadnyh-sistem","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"it_IT","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47KVM: \u0440\u0435\u0433\u0440\u0435\u0441\u0441\u0438\u0438 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u0438 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Fonte: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"