In message <[EMAIL PROTECTED]> Poul-Henning Kamp writes:
: If it is because the bios fiddles the frequency all the time we
: should maybe understand the APM bios better.

There were issues with some APM BIOSes not resetting this on resume,
but I think that we properly store/restore the state now.

: If it is because SMI interrupts "steal" time from us, then the
: TSC is maybe better.

This is an excellent theory since the problems are on newer laptops
that use SMI a whole lot.  But 6 seconds a minute is way too large to
account for this unless the SMI interrupts are timed really really
poorly.  On a high precision system we have here that needs to run off
the i8245, we've found that interrupts at the wrong time can cause
"dropouts" of 1 click of time.  Since these dropouts happen only once
in 1000 samples and are eliminated by the outlier elimination
mechanisms that we have in the software, I've not investigated this

I guess what I'm saying is that this might be possible, but I don't
know for sure if it is or not.


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