On Fri, Oct 22, 2010 at 11:39:47AM +0100, David J Taylor wrote: > Thanks, Dave. I may be missing something here, but it seems to me > that 4.2.7p58 still takes a number of hours to reach the accuracy > limits where thermal effects dominate. It's that which matters to > me, rather than something in the first few minutes. I agree the > graphs would not show such short time-scale initial disturbances.
Did the clock frequency change before you started the new version? I played with the latest ntp-dev a bit and there indeed is a improvement on start, mainly when the initial offset is around 0.01-0.05s. But the frequency error has to be very small to make a difference, see these plots: http://mlichvar.fedorapeople.org/tmp/ntp_start_offset.png http://mlichvar.fedorapeople.org/tmp/ntp_start_freq.png Also, I've noticed when ntpd is started without driftfile and the initial offset is over 0.05 second, the overshoot can easily reach 100 percent, is this expected? -- Miroslav Lichvar _______________________________________________ questions mailing list [email protected] http://lists.ntp.org/listinfo/questions
