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One of the issues with ntpd that started me being interested in this whole
timing stuff, and chrony was the presence of what seemed like oscillations in
the data. In this latest one, I again see oscillations, with about a 3000s
period. Do you have any idea what those could be?
How long is the typical time scale over which chrony keeps the data to fit the
linear regression to? What is the polling period?
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
--
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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