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Is there something that could be causing chrony to not recognize each sampl=
e? In my /etc/chrony.conf, I have the PPS listed as the following:
'refclock PPS /dev/pps1 trust prefer poll -6 pps'
Any insight would be greatly appreciated,
Benjamin Chang
Research Engineer I
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<p class=3D"MsoNormal">Hello,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">I’ve been trying to get my system to ingest a =
PPS system. I believe I got it to work, but I think I have an issue. Chrony=
only seems to recognize the PPS occasionally. I did the following to set i=
t up:<o:p></o:p></p>
<pre>$ yum install pps-tools<o:p></o:p></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Co=
urier New"">$ modprobe pps_ldisc<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Co=
urier New"">$ ldattach 18 /dev/ttyS1<o:p></o:p></span></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">From there, I can get timestamps via ppstest and pps=
watch, but when I do ‘chronyc sources,’ the LastRX field gets a=
ll the way up to 30-50 occasionally. I probed my PPS and it’s a consi=
stent 20us wide square wave that is about 5V.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">Is there something that could be causing chrony to n=
ot recognize each sample? In my /etc/chrony.conf, I have the PPS listed as =
the following:<o:p></o:p></p>
<p class=3D"MsoNormal">‘refclock PPS /dev/pps1 trust prefer poll -6 p=
ps’<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">Any insight would be greatly appreciated,<o:p></o:p>=
</p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
<p class=3D"MsoNormal">Benjamin Chang<o:p></o:p></p>
<p class=3D"MsoNormal">Research Engineer I<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p> </o:p></p>
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