4.2.7p52, p53, and p54 each had initial convergence improvements from
Dr. Mills. I encourage you to play with 4.2.7p54 or later and see for
yourself. ntpd now eliminates the majority of the startup offset in 5
minutes (with a drift file) or 10 minutes (without). During the
startup period, the frequency adjustment used to slew away the startup
offset is not retained, so there should be little "ringing".
Cheers,
Dave Hart
Dave,
Even though I try to follow NTP closely, I had missed the improvements in
initial convergence. I have installed 4.2.7p58 in my main PC Narvik, and
just rebooted it. It will be interesting to watch the new few minutes and
hours for the initial drift and then the longer term performance. This
under Windows XP, and LAN-synched.
http://www.satsignal.eu/mrtg/narvik_ntp-b.html
I also installed that version on a Windows-7 64-bit system - PC Hydra - to
see whether it behaved in the 4.2.4 or 4.2.5 mode. 4.2.4 has been a
better performer in tests here on Vista and Windows-7. PC Hydra was not
rebooted. I will be watching just the width of the offset graph, i.e. the
amount of jitter. This PC is also LAN-synched.
http://www.satsignal.eu/mrtg/hydra_ntp-b.html
Thanks for that pointer.
Cheers,
David
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