Re: [PATCH 0/2] Make the TSC safe to be used by gettimeofday().

[Christoph Lameter]

On Mon, 13 Nov 2006, Suleiman Souhlal wrote:

> I believe that the results returned will always be monotonic, as long as the
> frequency of the TSC does not change from under us (that is, without the
> kernel knowing). This is because we "synchronize" each CPU's vxtime with a
> global time source (HPET) every time we know the TSC rate changes.

TSC frequencies of different clocks coming with multiple 
processors may vary which creates a differential even if they are 
initially synchronized.
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