Re: [PATCH] Skip tsc synchronization checks if CONSTANT_TSC bit is set.

[Andi Kleen]

> the sync check is there to check the _offset_ between CPUs. CONSTANT_TSC 
> is not a guarantee that the TSC will be coherent across all CPUs.

I cannot find a quote for it in the docs now, but iirc the AMD 
definition of the bit guarantees offset, aka full synchronization
over the system.

-Andi
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