ntp.drift man page on DigitalUNIX

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ntp.drift(4)							  ntp.drift(4)

NAME
       ntp.drift - Network Time Protocol (NTP) drift file

DESCRIPTION
       When  the NTP daemon (xntpd) is first started, it computes the error in
       the intrinsic frequency of the clock on the computer it is running  on.
       This  process  usually  takes  about  a	day or two after the daemon is
       started to compute a good estimate of this (and it needs a  good	 esti‐
       mate  to synchronize closely to its server).  Once the initial value is
       computed, it will change only by relatively small  amounts  during  the
       course of continued operation.

       The  driftfile  declaration  should  always be included in the ntp.conf
       file.  This provides xntpd with complete path name to a file  in	 which
       it  can	store  the current value of the frequency error.  That way, if
       the daemon is stopped and restarted, it can reinitialize itself to  the
       previous estimate without spending time recomputing the frequency esti‐
       mate.

       The ntp.drift  file  contains  one  line	 with  the  following  format:
       freq_offset flag Specifies the nominal frequency offset.	 DO NOT modify
       this field.  Specifies the method used to improve  system  clock	 accu‐
       racy.  Specifies that xntpd runs a Phase-Locked Loop (PLL) algorithm to
       keep synchronized with other hosts.  This is  the  default.   Specifies
       the use of the PLL algorithm in the kernel.  This requires the NTP_TIME
       kernel option.  After the option is configured in the kernel, edit  the
       ntp.drift file and change the flag value to 1.

	      See System Administration for information on the NTP_TIME kernel
	      option.

FILES
       Conventional name of the drift file

RELATED INFORMATION
       Commands: ntpdate(8), ntpq(8), xntpd(8), xntpdc(8)

       Files: ntp.conf(4)

       Network Administration: Services, System Administration delim off

								  ntp.drift(4)
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