[ntp:questions] Loopstats jitter field mostly zero?

james machado hvgeekwtrvl at gmail.com
Tue Nov 27 07:05:21 UTC 2012


On Mon, Nov 26, 2012 at 1:27 PM, Dave Morgan <morgad at eclipse.co.uk> wrote:
> Dave Hart wrote:
>> I'd appreciate others taking a look at their loopstats on Linux
>> systems and especially non-x86 Linux to see if 0.000000000 shows up in
>> the jitter (fifth column).  I think we need more information to
>> understand the problem.
>>
>

on my RPi running as at stratum 1

# ntpq -c "rv 0 version" 127.0.0.1
version="ntpd 4.2.6p3 at 1.2290 Thu Oct 25 04:18:47 UTC 2012 (1)"

# uname -a
Linux pisces 3.6.1+ #1 Fri Nov 2 02:10:35 PDT 2012 armv6l GNU/Linux

# ntpq -c lpeers
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
*GPS_NMEA(0)     .GPS.            0 l    -    8  377    0.000  -114.47  45.790
oPPS(0)          .PPS.            0 l    2   16  377    0.000    0.002   0.002
-64.147.116.229  .ACTS.           1 u    9   64  377   37.443   13.267   0.804
+nist1-lv.ustimi .ACTS.           1 u   37   64  377   47.102   -8.095   0.815
+nist1-sj.ustimi .ACTS.           1 u   57   64  377   53.926   -0.576   0.764
-pool-test.ntp.o 216.218.254.202  2 u    -   64  377   35.388   -3.495   2.444
-four10.gac.edu  18.26.4.105      2 u    8   64  377   78.181    4.795   0.660
-ntp1.csl.tjhsst 192.5.41.41      2 u   37   64  337   91.164    8.840   0.491
-tick.tadatv.com 10.0.22.51       2 u   15   64  377   47.252    3.167   4.509


here is a typical view of my loopstats
# tail /var/log/ntpstats/loopstats
56258 24418.148 0.000001454 22.907 0.000000000 0.000375 4
56258 24434.148 0.000001005 22.908 0.000000000 0.000363 4
56258 24450.148 -0.000002531 22.907 0.000000000 0.000405 4
56258 24466.148 -0.000001953 22.907 0.000000000 0.000414 4
56258 24482.148 0.000000905 22.907 0.000000000 0.000395 4
56258 24498.148 -0.000002061 22.906 0.000000000 0.000410 4
56258 24514.148 -0.000002068 22.906 0.000000000 0.000423 4
56258 24530.148 0.000001085 22.906 0.000000000 0.000407 4
56258 24546.148 -0.000001675 22.906 0.000000000 0.000408 4
56258 24562.148 -0.000002359 22.905 0.000000000 0.000433 4

i checked my loopstats for the last 47,000 odd lines of loopstats I
have had 7 lines where the jitter has not been zero.

james


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