Yo Eric! On Thu, 19 Jan 2017 14:30:35 -0500 "Eric S. Raymond" <e...@thyrsus.com> wrote:
> Gary E. Miller <g...@rellim.com>:
> > > - to fuzz the low-order bits of the clock.
> >
> > Hmm, can you expand on this a bit? Which clock? How much fuzz?
> > Does this degrade anything?
>
> Whenever ntpd polls the system clock, it fuzzes the lowest-order
> digits of the result. The amount of fuzz to apply is bounded by half
> the measured interval between system clock ticks.
Hmm, and how much would that typically be?
> That shouldn't degrade anything. I presume it's a measure to foil
> timing attacks of some sort. Daniel might be able to say more.
At first glance this seems reasonable, but my experience with the
GR-601W suggests otherwise. My experience with the GR-601W shows that
ntpd can find a timing edge and hold onto it very well.
Whe ends up is there will be an offset of up to 1/1024 sec from the
correct time, but the jitter is much less.
Can you point me to this code? I want to rip it out and do a test.
RGDS
GARY
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