On Thursday 22 January 2009, fcassia wrote: > Can someone explain to me what IO APIC does? Why should one click that > option if you get "slower performance" as a result? what is the idea? > What benefit does it give? > > And why is Windows the only guest OS affected by fiddling with that > option after install?
The IO-APIC does not have a worse performance in general but it is harder to virtualize than the (legacy) PIC. For some guests, an IO-APIC is just required, for instance, if Windows was installed with another VMM and the IO-APIC was enabled or if a Windows installatiton from the host should be migrated to a VM. Linux has a hard-coded assumption for some specific AMD CPUs about the presence of an IO-APIC. Kind regards, Frank -- Dr.-Ing. Frank Mehnert Sun Microsystems http://www.sun.com/
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