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On Tue, 15 Nov 2011, Miroslav Lichvar wrote:
On Tue, Nov 15, 2011 at 10:32:28AM -0800, Bill Unruh wrote:
The graphs of the clock offset now look much nicer too:
http://mlichvar.fedorapeople.org/tmp/chrony_corr.png
Why the large jump in time offset at the beginning with the new procedure.
That looks suspicious. Also the oscillations in the time, while damped do not
look very strongly damped. (Q of maybe 10)
It's just a random spike. The starting offset is 1 ms and the jitter is
1 ms too. They were two separate simulations and were not using the
same random sequence for jitter and clock wander.
That graph was with default corrtimeratio 1.0, the following one is
with 10.0.
http://mlichvar.fedorapeople.org/tmp/chrony_corr2.png
Are those two separate realisations of the random process which perturb the
offset and rate, or are they the same? It might be an idea to use exactly the
same one for both so one can see better what the difference is. (Yes, I
recognize that the key difference is that the green curve is smoother than the
red curve which is a good thing, but other details are harder to separate out.
--
William G. Unruh | Canadian Institute for| Tel: +1(604)822-3273
Physics&Astronomy | Advanced Research | Fax: +1(604)822-5324
UBC, Vancouver,BC | Program in Cosmology | unruh@xxxxxxxxxxxxxx
Canada V6T 1Z1 | and Gravity | www.theory.physics.ubc.ca/
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