[ntp:questions] Re: drift/offset
Folkert van Heusden
folkert at vanheusden.com
Thu Feb 3 16:49:05 UTC 2005
> The graph at http://keetweej.vanheusden.com/ntp_graph.png
> appears to show points taken at intervals of much less than your poll
> interval of 64 seconds!
No, every 5 minuts a sample is taken. Latest sample on the right.
> How are you computing the offsets? An offset
> is presumably t2 - t1; what is the source of t2 and t1 for each point
> on the graph?
echo `date +"%s"` `/usr/sbin/ntpdc -c loopinfo localhost | /bin/grep frequency | /bin/awk '{ print $2; }'` `/usr/sbin/ntpq -c pe | /bin/grep -e "^*" | /usr/bin/awk '{ print $9; }'` >> /var/log/ntp.stats.log
So it is the frequency-field of ntpdc -c loopinfo for the drift, and
for the offset I take the offset-field of the line with * at the first
position of ntpq -c pe:
remote refid st t when poll reach delay offset jitter
==============================================================================
*GENERIC(0) .DCFa. 0 l 38 64 377 0.000 0.349 3.695
^ ^^^^^
Folkert van Heusden
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