Time Variances

Thu Mar 9 18:22:54 UTC 2006

I'm having difficulty with getting my clock synchronized

Initially I was doing nothing except running ntpdate from CLI after a
reboot

The variance was unacceptable, often into the teens of minutes, but I
had other proggyz to sort so shelved the resolution of the problem as
operationally it wasn't really affecting anything

But a few days ago I decided to resolve whatever was going wrong and
ran ntpdate as a cronjob hourly which indicated variances up to 20
seconds per hour [see below]

Seeking a means of reduing the variance, I discovered vsntp which
seemed to fix the problem

Then reading more on ntpdate, I discovered that ntpdate is deprecated
by Slackware in favour of NTP

So nothing deterred, I fired up NTP to run concurently with VSNTP, but
found that I had then no real means of checking the variance since the
ntpdate cronjob fails with a "Socket Busy" when NTP is running

So after a day or so I killed NTP which allowed the cronjob to fire
successfully and everything looked rosy

But now the variances are drifting up again and currently I am running
NTP again but thr jitters are increasing generally:

     remote           refid      st t when poll reach   delay   offset
     jitter
==============================================================================
 ntp-p1.obspm.fr .1PPS.           1 u   36   64  177   47.816  360.069
     1297.39
 dense.utcc.utor 128.100.96.226   2 u   34   64  177  156.087  2206.00
     1202.32

and a few seconds later:

     remote           refid      st t when poll reach   delay   offset
     jitter
==============================================================================
 ntp-p1.obspm.fr .1PPS.           1 u   30   64  377   47.816  360.069
     1468.51
 dense.utcc.utor 128.100.96.226   2 u   26   64  377  156.087  2206.00
     1122.38

ntp-p1.obspm.fr is the French Observatory in Paris
dense.utcc.utor is the UofT

The clock used with vsntp is one just up the road from me in Sophia
Antipolis, the French version of Silicon Valley at 138.96.64.10

Any suggestions?

[CRONJOB - NO VSMTP]
 4 Mar 06:47:18 ntpdate[22473]: step time server 128.100.100.128 offset 15.524994 sec
 4 Mar 07:47:42 ntpdate[4611]: step time server 128.100.100.128 offset 21.248208 sec
 4 Mar 08:47:42 ntpdate[24561]: step time server 128.100.100.128 offset 20.236947 sec
 4 Mar 09:47:37 ntpdate[12056]: step time server 128.100.100.128 offset 17.524826 sec
 4 Mar 10:47:34 ntpdate[31945]: step time server 128.100.100.128 offset 9.176542 sec
 4 Mar 11:47:29 ntpdate[19344]: step time server 128.100.100.128 offset 9.025376 sec
 4 Mar 12:47:37 ntpdate[7057]: step time server 128.100.100.128 offset 18.196358 sec
 4 Mar 13:47:37 ntpdate[27266]: step time server 128.100.100.128 offset 16.114446 sec
 4 Mar 14:47:38 ntpdate[14842]: step time server 128.100.100.128 offset 16.678650 sec
 4 Mar 15:47:34 ntpdate[2339]: step time server 128.100.100.128 offset 14.285041 sec
 4 Mar 16:47:37 ntpdate[22473]: step time server 128.100.100.128 offset 15.859449 sec
 4 Mar 17:47:38 ntpdate[10058]: step time server 128.100.100.128 offset 16.010695 sec
 4 Mar 18:47:51 ntpdate[30006]: step time server 128.100.100.128 offset 11.570608 sec
 4 Mar 19:47:56 ntpdate[17764]: step time server 128.100.100.128 offset 17.151896 sec
 4 Mar 20:47:54 ntpdate[5474]: step time server 128.100.100.128 offset 14.893247 sec
 4 Mar 21:47:37 ntpdate[25558]: step time server 128.100.100.128 offset 15.477404 sec
 4 Mar 22:47:28 ntpdate[13052]: step time server 128.100.100.128 offset 7.247652 sec
 4 Mar 23:47:37 ntpdate[851]: step time server 128.100.100.128 offset 14.771628 sec
 5 Mar 00:47:37 ntpdate[21032]: step time server 128.100.100.128 offset 15.036640 sec
 5 Mar 01:47:38 ntpdate[8774]: step time server 128.100.100.128 offset 16.277043 sec
 5 Mar 02:47:36 ntpdate[28866]: step time server 128.100.100.128 offset 15.046614 sec
 5 Mar 03:47:38 ntpdate[16730]: step time server 128.100.100.128 offset 16.877958 sec
 5 Mar 04:47:48 ntpdate[7837]: step time server 128.100.100.128 offset 13.564032 sec
 5 Mar 05:47:43 ntpdate[27972]: step time server 128.100.100.128 offset 16.607619 sec
 5 Mar 06:47:40 ntpdate[15426]: step time server 128.100.100.128 offset 12.447754 sec
 5 Mar 07:47:32 ntpdate[2875]: step time server 128.100.100.128 offset 7.623997 sec
 5 Mar 08:47:37 ntpdate[22776]: step time server 128.100.100.128 offset 16.826881 sec
 5 Mar 09:47:28 ntpdate[10212]: step time server 128.100.100.128 offset 7.495377 sec
 5 Mar 10:47:38 ntpdate[30116]: step time server 128.100.100.128 offset 15.964756 sec
 5 Mar 11:47:39 ntpdate[17643]: step time server 128.100.100.128 offset 17.445783 sec
 5 Mar 12:47:37 ntpdate[5274]: step time server 128.100.100.128 offset 16.576393 sec
 5 Mar 13:47:35 ntpdate[25337]: step time server 128.100.100.128 offset 15.197266 sec
 5 Mar 14:47:43 ntpdate[12939]: step time server 128.100.100.128 offset 12.906830 sec
 5 Mar 15:47:38 ntpdate[620]: step time server 128.100.100.128 offset 15.666824 sec
 5 Mar 16:47:38 ntpdate[20968]: step time server 128.100.100.128 offset 15.976715 sec
 5 Mar 17:47:36 ntpdate[8585]: step time server 128.100.100.128 offset 13.947549 sec
 5 Mar 18:47:41 ntpdate[28711]: step time server 128.100.100.128 offset 9.169122 sec
 5 Mar 20:03:02 ntpdate[16234]: step time server 128.100.100.128 offset 6.516722 sec
 5 Mar 20:47:36 ntpdate[3851]: step time server 128.100.100.128 offset 9.407558 sec
 5 Mar 21:47:35 ntpdate[23902]: step time server 128.100.100.128 offset 15.531222 sec
 5 Mar 22:47:32 ntpdate[11852]: step time server 128.100.100.128 offset 11.030878 sec
 5 Mar 23:47:34 ntpdate[31809]: step time server 128.100.100.128 offset 3.262929 sec
 6 Mar 00:47:29 ntpdate[19280]: step time server 128.100.100.128 offset 3.999106 sec
 6 Mar 01:47:41 ntpdate[6759]: step time server 128.100.100.128 offset 7.877242 sec
 6 Mar 02:47:26 ntpdate[26679]: step time server 128.100.100.128 offset 6.230453 sec
 6 Mar 03:47:40 ntpdate[14124]: step time server 128.100.100.128 offset 13.319546 sec
 6 Mar 04:47:56 ntpdate[7421]: step time server 128.100.100.128 offset 3.746341 sec
 6 Mar 05:47:35 ntpdate[31449]: step time server 128.100.100.128 offset 5.435200 sec
 6 Mar 06:47:43 ntpdate[18890]: step time server 128.100.100.128 offset 17.696320 sec
[CRONJOB running with VSNTP fired up] 
6 Mar 08:47:22 ntpdate[29012]: adjust time server 128.100.100.128 offset 0.237108 sec
 6 Mar 09:47:31 ntpdate[16664]: adjust time server 128.100.100.128 offset 0.002529 sec
 6 Mar 10:47:25 ntpdate[4183]: adjust time server 128.100.100.128 offset 0.000751 sec
 6 Mar 11:47:21 ntpdate[24183]: adjust time server 128.100.100.128 offset 0.095641 sec
 6 Mar 12:47:33 ntpdate[22383]: adjust time server 128.100.100.128 offset 0.299229 sec
 6 Mar 13:47:18 ntpdate[9766]: adjust time server 128.100.100.128 offset 0.301915 sec
 6 Mar 14:47:20 ntpdate[29747]: adjust time server 128.100.100.128 offset -0.002426 sec
 6 Mar 15:47:18 ntpdate[17251]: adjust time server 128.100.100.128 offset 0.239366 sec
 6 Mar 16:47:21 ntpdate[4851]: adjust time server 128.100.100.128 offset 0.219349 sec
 6 Mar 17:47:21 ntpdate[25006]: adjust time server 128.100.100.128 offset 0.229666 sec
 6 Mar 18:47:24 ntpdate[12793]: adjust time server 128.100.100.128 offset 0.248894 sec
 6 Mar 19:47:20 ntpdate[1718]: adjust time server 128.100.100.128 offset 0.219077 sec
 6 Mar 20:47:19 ntpdate[23101]: adjust time server 128.100.100.128 offset 0.239077 sec
 6 Mar 21:47:22 ntpdate[12073]: adjust time server 128.100.100.128 offset 0.227497 sec
 6 Mar 22:47:18 ntpdate[32477]: adjust time server 128.100.100.128 offset 0.227336 sec
[NTP Substituted for NTPDATE until March 8 when NTP shut down due to
 increasing jitter and ntpdate cronjob fires again]
 8 Mar 10:47:33 ntpdate[22480]: step time server 128.100.100.128 offset 0.844554 sec
 8 Mar 11:47:28 ntpdate[10165]: adjust time server 128.100.100.128 offset -0.004699 sec
 8 Mar 12:47:22 ntpdate[30227]: step time server 128.100.100.128 offset 0.864903 sec
 8 Mar 13:47:22 ntpdate[17818]: step time server 128.100.100.128 offset 0.524625 sec
 8 Mar 14:47:25 ntpdate[5735]: adjust time server 128.100.100.128 offset 0.289538 sec
 8 Mar 15:47:21 ntpdate[26108]: step time server 128.100.100.128 offset 0.614931 sec
 8 Mar 16:47:19 ntpdate[13764]: adjust time server 128.100.100.128 offset 0.473800 sec
 8 Mar 17:47:21 ntpdate[1331]: step time server 128.100.100.128 offset 0.794130 sec
 8 Mar 18:47:28 ntpdate[21188]: step time server 128.100.100.128 offset 0.894673 sec
 8 Mar 19:47:22 ntpdate[8636]: step time server 128.100.100.128 offset 0.795001 sec
 8 Mar 20:47:22 ntpdate[28510]: adjust time server 128.100.100.128 offset 0.445598 sec
 8 Mar 21:47:21 ntpdate[16003]: step time server 128.100.100.128 offset 0.825372 sec
 8 Mar 22:47:21 ntpdate[3544]: step time server 128.100.100.128 offset 0.625176 sec
 8 Mar 23:47:23 ntpdate[23453]: adjust time server 128.100.100.128 offset 0.466934 sec
 9 Mar 00:47:19 ntpdate[10922]: adjust time server 128.100.100.128 offset 0.494969 sec
 9 Mar 01:47:26 ntpdate[30882]: adjust time server 128.100.100.128 offset -0.004577 sec
 9 Mar 02:47:21 ntpdate[18324]: step time server 128.100.100.128 offset 0.645427 sec
 9 Mar 03:47:22 ntpdate[5947]: step time server 128.100.100.128 offset 0.646481 sec
 9 Mar 04:47:40 ntpdate[29086]: adjust time server 128.100.100.128 offset -0.010351 sec
[TROUBLE AGAIN - note: I changed nothing at this point]
 9 Mar 05:47:31 ntpdate[16457]: step time server 128.100.100.128 offset 3.165814 sec
 9 Mar 06:47:40 ntpdate[3827]: step time server 128.100.100.128 offset 13.365056 sec
 9 Mar 07:47:38 ntpdate[23679]: step time server 128.100.100.128 offset 9.373213 sec
 9 Mar 08:47:37 ntpdate[11059]: step time server 128.100.100.128 offset 12.645140 sec
 9 Mar 09:47:30 ntpdate[30876]: step time server 128.100.100.128 offset 10.244803 sec
 9 Mar 10:47:29 ntpdate[18280]: step time server 128.100.100.128 offset 10.565096 sec
 9 Mar 11:47:44 ntpdate[12835]: step time server 128.100.100.128 offset 18.945630 sec
 9 Mar 12:47:38 ntpdate[7588]: step time server 128.100.100.128 offset 16.945920 sec
 9 Mar 13:47:47 ntpdate[27468]: step time server 128.100.100.128 offset 20.744349 sec
 9 Mar 14:47:38 ntpdate[14943]: step time server 128.100.100.128 offset 18.264154 sec

-- 
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http://brevets-logiciels.info/

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