in article <[EMAIL PROTECTED]>, [EMAIL PROTECTED] (DeviPrasad Natesan) wrote:
> When does the NTP takes decision on changing the "offset" > (ADJ_OFFSET_SINGLESHOT) and when "tick" (ADJ_TICK). For version 4.2.0, never: [EMAIL PROTECTED]:~/ntp-4.2.0$ find . -type f | grep ADJ_OFFSET_SINGLESHOT [EMAIL PROTECTED]:~/ntp-4.2.0$ However, I think the answer to question that you are really trying to ask is: in ntpd/ntp_loopfilter.c. If I remember correctly, this roughly corresponds to, in the default configuration of the source code, step if offset exceeds 128ms for an extended period, otherwise slew. > Is there any provision to control the frequency of the osciallator if > we have an TCXO or OCXO without changing the "tick" in the kernel to No. Any such mechanism would have to be calibrated to obtain the same loop gain as the purely digital approach, although I'm not sure that anything is dependent on 100% accuracy. The other problem is that, on good systems, the correction calculations are performed on every clock tick, at interrupt level. You would probably have to revert to correcting every 4 seconds, at application level, potentially resulting in less accurate time keeping when rates were changing. _______________________________________________ questions mailing list [email protected] https://lists.ntp.isc.org/mailman/listinfo/questions
