Hello,
I have a laptop configured as a proof of concept system. It's an older Lenovo
laptop with an Intel Corporation Ethernet Connection I218-LM (rev 04),
configured as an e1000 device. "ethtool -T enp0s25" shows both software and
hardware timestamping available.
Feeding into this system are two ptp clock streams in domain 44. I am running
timemaster with ptp4l, and chrony. My desire is to have ptp (since it's more
accurate) set the local clock and fallback to ntp when a failure occurs. The
system would then serve ntp.
Timemaster, chronyd, ptp4l, and phc2sys are all running.
21680 ? Ss 0:00 /usr/sbin/timemaster -f /etc/timemaster.conf
21681 ? S 0:00 \_ /usr/sbin/chronyd -u chrony -n -f
/var/run/timemaster/chrony.conf
21682 ? S 0:09 \_ /usr/sbin/ptp4l -l 5 -f
/var/run/timemaster/ptp4l.0.conf -H -i enp0s25
21683 ? S 0:00 \_ /usr/sbin/phc2sys -l 5 -a -r -R 1.00 -z
/var/run/timemaster/ptp4l.0.socket -t [44:enp0s25 ] -n 44 -E ntpshm -M 0
I noticed three things:
1. Chronyc sources shows
* 210 Number of sources = 5
* MS Name/IP address Stratum Poll Reach LastRx Last sample
*
===============================================================================
* #? PTP0 0 2 0 - +0ns[ +0ns]
+/- 0nsq
* ^+ time-c-b.nist.gov 1 4 377 5 +7083us[+7083us]
+/- 28ms
* ^+ time2.google.com 1 4 377 7 +333us[ +333us]
+/- 28ms
* ^* usscz2-ntp-001.aaplimg.c> 1 4 377 5 -780us[ -780us]
+/- 11ms
* ^+ clock.fmt.he.net 1 4 377 6 -2245us[-2245us]
+/- 14ms
Why is chrony showing PTP0 as a problem?
1. And when using this system as an ntp source on another system it shows as
a stratum 2 system. Shouldn't this be a stratum 1, given the ptp0 clock?
2. A lot of messages in /var/log/messages:
* [44:enp0s25] port 1: received SYNC without timestamp
Thank you for your time!
Jason Brooks
Senior Cloud Infrastructure Engineer
Infrastructure and Engineering Services
Allstream
www.allstream.com<http://www.allstream.com/>
[id:image001.jpg@01D2AD47.F9210620]<http://www.allstream.com/>
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