another ntp problem

[thebeatlesguru]

one box ntp server is GPS,its syslog.log has messages as following:
Feb 27 10:34:10 netf-pd xntpd[3895]: time reset (step) -0.245374 s
Feb 27 10:34:10 netf-pd xntpd[3895]: synchronisation lost
Feb 27 10:39:30 netf-pd xntpd[3895]: synchronized to 202.109.93.*, stratum=1
Feb 27 10:39:30 netf-pd xntpd[3895]: time reset (step) 0.236315 s
Feb 27 10:39:30 netf-pd xntpd[3895]: synchronisation lost
Feb 27 10:44:50 netf-pd xntpd[3895]: synchronized to 202.109.93.*, stratum=1
Feb 27 11:03:07 netf-pd xntpd[5982]: xntpd version=3.5f; Thu Oct 23 13:37:20 PDT 1997 (6)
Feb 27 11:03:07 netf-pd xntpd[5982]: tickadj = 625, tick = 10000, tvu_maxslew = 61875
Feb 27 11:03:07 netf-pd xntpd[5982]: precision = 9 usec
Feb 27 11:07:24 netf-pd xntpd[5982]: synchronized to 202.109.93.*, stratum=1

is there some problem :synchronisation lost?
what does the message mean?

[Scott Van Kalken · Accepted solution]

This is simply your server adjusting the clock.

I suspect that one of the time sources is either over a WAN or a slow(ish) network.

the man page for xntpd explains this in detail, and explains the specific messages you've been seeing.

man xntpd

nothing terribly much to worry about.

Scott.

[Scott Van Kalken]

I also just noticed you said one server is a GPS clock.

If this is the case, you will notice even the smallest of small incremental adjustments.

Once again, the man page describes this.

Scott.

[S.K. Chan]

This message indicates that NTP has cleared all of the statistics registers and has begun the startup procedure of evaluating all available timeservers and choosing the "best" one. This message appears whenever a step adjustment (greater than 128 milliseconds) is made, since the step leaves the system unsynchronized by definition. If your system is making a lot of step adjustments, it probably means that you have network congestion problems. Run "ntpq -p" and examine the dispersion statistics.

[thebeatlesguru]

remote refid st t when poll reach delay offset disp
==============================================================================
*ppp54-93-109-20 .GPS. 1 u 108 256 377 6.42 1.384 1.69

something wrong?

[Scott Van Kalken]

looks like a slow network connection to me.

Is this via a modem or the network?

[Karvendhan M]

hi,

it is because of slow network connction.
the delay column indicates it. and the sync. lost message is because the xntpd detected 128 mili sec. dif between the two clocks.

try to use a fater link or setup a GPS clock in your local lan.

Hope this helps.

~ Karvendhan M