[ntp:questions] Re: linux system clock egregiously slow!

Hal Murray hmurray at suespammers.org
Fri Jan 23 01:57:18 UTC 2004


>What I also learned was that our 27MHz RTC timers and our PCC are
>running off the exact same crystal.  That is interesting, because it
>means I should expect ZERO deviation between the PCC and the MIPS
>frequency.  The fact that I see 2637 PPM is a pretty bad systematic
>error!!!

Not if your system is using the standard spread spectrum anti-EMI
clock generation hacks.  (I'm beginning to feel like a broken record.)

Just because your crystal says 30 PPM on it doesn't mean that
some hardware between your crystal and the CPU doesn't screw
things up.

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