{"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\/da\/blog\/news\/kvm-regressii-proizvoditelnosti-i-obsuzhdenie-podderzhki-32-razryadnyh-sistem","title":{"rendered":"KVM: pr\u00e6stationsregressioner og diskussion om underst\u00f8ttelse af 32-bit systemer","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

I Linux-kernen 6.13-rc3 er der blevet vedtaget en \u00e6ndring, der fjerner en regressionsfejl i KVM-hypervisorens ydeevne, relateret til langsom behandling af CPUID-opkald p\u00e5 nye CPU'er. For eksempel udf\u00f8res CPUID-operationer p\u00e5 Intel Emerald Rapids CPU'er 3-4 gange langsommere end p\u00e5 Intel Skylake CPU'er. Denne egenskab har f\u00f8rt til en reduktion i ydeevnen for KVM-hypervisoren, der bruger CPUID under gemning og genopretning af processorens tilstand ved hver overf\u00f8rsel af kontrol til den virtuelle maskine, i tilf\u00e6lde af at der anvendes indlejret virtualisering. For at l\u00f8se problemet er der i kernel 6.13 blevet vedtaget en forkortet patch, som har reduceret operationstiden med op til 40%, selv p\u00e5 Skylake CPU'er, takket v\u00e6re caching af CPUID. Den fulde version af patchen vil blive pr\u00e6senteret i kernel 6.14, som yderligere forbedrer ydeevnen. <\/p>\n

Derudover kan det n\u00e6vnes, at der i mailinglisten for Linux-kernens udviklere er blevet diskuteret at stoppe st\u00f8tten til 32-bit systemer i hypervisoren. KVM<\/a>Oprindeligt blev der foresl\u00e5et en patch til kernen, der fjerner underst\u00f8ttelsen af KVM-virtualisering p\u00e5 x86-32 platformen. Som svar blev der givet udtryk for bekymringer om, at underst\u00f8ttelse af x86-32 kunne v\u00e6re nyttig til at teste driften af host-tilstand generelt p\u00e5 32-bit systemer, da der i kernen ud over x86-32 stadig er tre 32-bit arkitekturer, der underst\u00f8ttes i KVM. Som svar blev der pr\u00e6senteret endnu en patch, denne gang der fjerner underst\u00f8ttelsen af alle 32-bit systemer fra KVM. <\/p>\n

\u00d8nsket om at fjerne st\u00f8tten til 32-bit systemer forklares med, at selv p\u00e5 de almindelige 32-bit ARM-processorer, s\u00e5som ARM Cortex A7, har virtualisering ikke f\u00e5et udvikling og brug. virtual machines<\/a> Brugen af 32-bit systemer p\u00e5 ARM har v\u00e6ret s\u00e5 sj\u00e6lden, at st\u00f8tten til disse systemer i KVM blev fjernet i 2020, og dette vakte ikke indvendinger. Det n\u00e6vnes, at for de resterende 32-bit systemer vil \u00e6ndringerne kun p\u00e5virke eksotiske platforme, som l\u00e6nge ikke har v\u00e6ret anvendt i praksis eller som aldrig har v\u00e6ret popul\u00e6re. Blandt de processorer, som patchen ber\u00f8rer, er Intel Core Duo\/Silverthorne, PowerPC e300\/e500\/e600 og MIPS P5600. Patchen er offentliggjort som RFC, hvilket betyder, at den er sendt til diskussion.
\n
Kilde: 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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