[ntp:questions] why is my pool server's offset so bad

Dennis Hilberg, Jr. timekeeper at dennishilberg.com.invalid
Sat Jan 19 17:08:52 UTC 2008


Pat Farrell wrote:
> It used to be great. Now if you look at the stats, say at
> http://www.pool.ntp.org/scores/70.184.242.241
> you see its terrible.
> 
> What am I doing wrong?
> 
> thanks
> pat

When did you first notice the poor behavior?  Is there some change you made 
about that time that could be the cause?

Is the connection heavily loaded?  I did a 30-packet ping on your 
connection, and while there was no packet loss, your ping times ranged 
anywhere from 89ms to 108ms.

I also mobilized an association with your server, here's a sample:

saturn:$ ntpq -pn
      remote           refid    st t when poll reach   delay   offset  jitter
============================================================================
*127.127.28.0    .PPS.          0 l    2   16  377    0.000    0.005   0.001
+127.127.20.0    .GPS.          0 l    -   16  377    0.000   -4.684   0.212
-140.142.16.34   .USNO.         1 u   40   64  377   14.155   -0.197   3.389
+132.249.20.88   .WWVB.         1 u    1   64  377   43.097   -1.901   2.597
-216.218.254.202 .CDMA.         1 u    4   64  377   35.131   -0.886  13.000
-198.60.22.240   .GPS.          1 u    1   64  377   53.884   -0.055   3.181
x70.184.242.241  198.82.1.202   3 u   19   64  377   93.164  -117.18  14.863

That jitter is actually pretty low compared to what I saw last night.  It 
was up into the 40ms range.  No doubt your network is part of the problem.

What does 'ntpq -p' and 'ntpq -crv' show?

-- 
Dennis Hilberg, Jr.     \  timekeeper(at)dennishilberg(dot)com
NTP Server Information:  \  http://saturn.dennishilberg.com/ntp.php




More information about the questions mailing list