[ntp:questions] NTP 4.2.2p4 loopstats

John Gill jg at jgill.net
Mon Nov 6 01:52:16 UTC 2006


David,

Many thanks for the prompt reply.

Since this was not an intentional change, I suspect something went awry 
in my build process.

Below is the output of ntpq -c rv:

assID=0 status=06f4 leap_none, sync_ntp, 15 events, event_peer/strat_chg,
version="ntpd 4.2.2p4 at 1.1585 Sat Nov  4 15:04:11 UTC 2006 (1)",
processor="i686", system="Linux/2.4.20-31.9", leap=00, stratum=2,
precision=-19, rootdelay=61.646, rootdispersion=62.344, peer=12046,
refid=18.26.4.105,
reftime=c8f90653.d1be3eb7  Sun, Nov  5 2006 19:54:43.819, poll=10,
clock=c8f90913.d0228a6a  Sun, Nov  5 2006 20:06:27.813, state=4,
offset=-15.298, frequency=-4.674, jitter=15.307, noise=4.414,
stability=0.021

and the relevant line from loopstats:

54045 3283.819 -0.015298000 -4.674 0.004414435 0.020715 10

The tarball was downloaded from ntp.isc.org on 11/4, and was built with 
no configure options.

I'll try another compile when time permits and see what happens.

Thanks,

jg


David L. Mills wrote:
> jg,
> 
> The source and interpretation of the loopstats data have not changed in 
> several years. The fields in order are MJD, seconds of the day, offset 
> (s), frequency (PPM), jitter (s), wander/stability (PPM) and time 
> constant/poll interval (log2 s). If you are using a distribution not 
> from here, anything goes.
> 
> Note the statistics from the ntpq rv command, which has for a long time 
> showed stability/wander and noise. There is a technical reason for this, 
> but a careful explanation would bore you to tears. Someday all this 
> should be rationalized with respect to the reference documentation.
> 
> Dave
> 
> jg wrote:
> 
>> I just upgraded my old Red Hat 9 box from 4.2.0 to 4.2.2p4.  The field 
>> in loopstats that formerly reported the 'jitter' value now appears to 
>> report 'noise' instead.
>> Is this a bug or a feature, and can someone point me to a simple 
>> definition of noise?
>>
>> TIA,
>> jg




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