Bill,
The ntpdsim simulator uses the real system clock, which is modeled as
the Allan variance. However, the server clock is modeled as a
random-walk process computed as the integral of a Gaussian process. The
network is modeled as an exponential distribution, although provisions
have been made to model transients in the form of step changes.
Dave
unruh wrote:
On 2010-06-30, David Woolley <[email protected]> wrote:
Miroslav Lichvar wrote:
and is using the LOCAL driver, the rest have clocks with 1ppb/s
wander. Between all nodes is network delay with exponential
distribution and a constant jitter. The simulations are repeated with
Real world NTP networks don't behave like that, and most of the things
that annoy people relate to the real world behaviour. Real networks are
subject to diurnal and near step changes in frequency.
? It seems you are discussing the behaviour of the clocks, not of the
network. (the network has no frequency). His simulator works with real
clocks which have exactly the behaviour you describe. Now it may be that
the network model is not the best ( random "long" delays in one way trip
time due to network overload).
Dr Mills modelling also has this problem.
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