Re: [RFC] fix VMX TSC synchronicity

Avi Kivity
2008-01-20T14:59:26Z

Marcelo Tosatti wrote:
> Avi, do you understand why C3 was causing the Windows SMP problems ?
>
>

It may be that the latency was advertised as so low that Windows
switched into C3 and back too often.

Also, the problem possibly wasn't SMP related but rather TPR related --
when the idle loop called acpi to do the mode switches, that caused many
tpr hits. Perhaps with a FlexPriority enabled processor it would work
better.

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