I've been doing a little research here.
On one server I have the munin plugins version 2.0.6 from Debian
packages in backports.
The munin plugin ntp_kernel_pll_off uses the output of ntpq -c kerninfo
or ntpdc -c kerninfo, whatever is available, then matches /^pll offset:/
and prints the value:
~# ntpdc -c kerninfo
pll offset: -0.00024676 s
pll frequency: -81.448 ppm
maximum error: 0.797547 s
estimated error: 0.000573 s
status: 2001 pll nano
pll time constant: 10
precision: 1e-09 s
frequency tolerance: 500 ppm
~# ntpdc -c kerninfo | awk '/^pll offset:/ { print $3 }'
-0.00024652
Now, what happens with 4.2.8? I tried to do the same on my workstation
running Debian Jessie and ntpd 4.2.8p3. ntpdc -c kerninfo fails:
bronto@brabham:~$ sudo ntpdc -c kerninfo
localhost: timed out, nothing received
***Request timed out
bronto@brabham:~$
ntpdc -c kerninfo works, but...
bronto@brabham:~$ sudo ntpq -c kerninfo
associd=0 status=0618 leap_none, sync_ntp, 1 event, no_sys_peer,
pll offset: -0.075818
pll frequency: 7.23193
maximum error: 0.2435
estimated error: 0
kernel status: pll nano
pll time constant: 7
precision: 1e-06
frequency tolerance: 500
pps frequency: 0
pps stability: 0
pps jitter: 0
calibration interval 0
calibration cycles: 0
jitter exceeded: 0
stability exceeded: 0
calibration errors: 0
bronto@brabham:~$
No unit, but I'd speculate that pll offset is milliseconds instead of
seconds... That's what confuses munin, I believe: where the two commands
provide the same information, ntpq prints it without specifying the unit
AND uses a different unit for pll offset.
I'm not sure if that should be considered a bug in ntpq. In case, let me
know and I'll submit a bug report.
Ciao
-- bronto
PS: For your reference, here's the code of the munin plugin.
> ~# cat /etc/munin/plugins/ntp_kernel_pll_off
> #!/bin/sh
> # -*- sh -*-
>
> : <<EOF
>
> =head1 NAME
>
> ntp_kernel_pll_off - Plugin to monitor the kernel's PLL offset for the
> NTP status
>
> =head1 CONFIGURATION
>
> No configuration
>
> =head1 AUTHORS
>
> Unknown author
>
> =head1 LICENSE
>
> GPLv2
>
> =head1 MAGIC MARKERS
>
> #%# family=auto
> #%# capabilities=autoconf
>
> =cut
>
> EOF
>
> export PATH=/usr/local/sbin:$PATH
>
> if [ "$1" = "autoconf" ]; then
> { ntpq -c kerninfo; ntpdc -c kerninfo; } 2>/dev/null |
> awk 'BEGIN { ev=1; }
> /^pll offset:/ { ev=0; }
> END { if (ev == 0) { print "yes";} else { print "no"; } exit ev; }'
> exit 0
> fi
>
> if [ "$1" = "config" ]; then
> echo 'graph_title NTP kernel PLL offset (secs)'
> echo 'graph_vlabel PLL offset (secs)'
> echo 'graph_category time'
> echo 'graph_info The kernel offset for the phase-locked loop used by NTP'
> echo 'ntp_pll_off.label pll-offset'
> echo 'ntp_pll_off.info Phase-locked loop offset in seconds'
> exit 0
> fi
>
> printf 'ntp_pll_off.value '
>
> if [ $(ntpq -c version | grep --extended-regexp --only-matching
> '[[:digit:]]\.[[:digit:]]\.[[:digit:]]' | tr -d '.') -ge 427 ]
> then
> cmd=ntpq
> else
> cmd=ntpdc
> fi
>
> $cmd -c kerninfo | awk '/^pll offset:/ { print $3 }'
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