Hello fellow linuxptp users,
I am fairly new to linuxptp and I am currently trying to synchronize 3
devices, 2 custom boards (on which I do not have any information) and
one Intel-Atom based embedded computer with a network card with an
Intel-82574 GbE LAN controller. The devices are connected via an aruba
2930M switch.
When I start ptp4l on all devices for the first time after booting, I
usually get very poor results (offsets > 100us) on at least one device,
which can probably be attributed to the unstable and high delays. To
give you an impression:
ptp4l[390.901]: master offset -885335 s2 freq +2931837 path
delay 1822
ptp4l[390.909]: master offset -904739 s2 freq +2834634 path
delay 1822
ptp4l[390.917]: master offset -924167 s2 freq +2736521 path
delay 1822
ptp4l[390.948]: master offset -1006909 s2 freq +2444842 path
delay 1822
ptp4l[390.952]: port 1: minimum delay request interval 2^0
ptp4l[390.952]: port 1: minimum delay request interval 2^-3
ptp4l[390.956]: master offset -1023747 s2 freq +2350212 path
delay 3050
ptp4l[390.964]: master offset -889030 s2 freq +2716197 path
delay 3050
ptp4l[390.971]: master offset -743951 s2 freq +3119528 path
delay 3050
ptp4l[390.987]: master offset -449849 s2 freq +3982740 path
delay 3050
ptp4l[391.003]: master offset -499055 s2 freq +3813577 path
delay 3050
ptp4l[391.011]: master offset -525148 s2 freq +3712652 path
delay 3050
ptp4l[391.019]: master offset -551199 s2 freq +3610730 path
delay 3050
ptp4l[391.026]: master offset -576386 s2 freq +3510316 path
delay 3050
ptp4l[391.050]: master offset -655698 s2 freq +3244059 path
delay 3050
ptp4l[391.074]: master offset -728610 s2 freq +2993866 path
delay 3050
ptp4l[391.081]: master offset -748295 s2 freq +2902559 path
delay 3050
ptp4l[391.089]: master offset -767749 s2 freq +2811106 path
delay 3050
ptp4l[391.097]: master offset -786740 s2 freq +2720225 path
delay 3050
ptp4l[391.152]: master offset 279573 s2 freq +5932237 path
delay 3050
ptp4l[391.160]: master offset 249062 s2 freq +5851403 path
delay 3050
ptp4l[391.168]: master offset 345180 s2 freq +6154719 path
delay 3050
ptp4l[391.184]: master offset 591803 s2 freq +6920319 path
delay 3050
ptp4l[391.187]: port 1: minimum delay request interval 2^0
ptp4l[391.187]: port 1: minimum delay request interval 2^-3
ptp4l[391.191]: master offset 708371 s2 freq +7300649 path
delay -1470
ptp4l[391.199]: master offset 817418 s2 freq +7663107 path
delay -1470
ptp4l[391.207]: master offset 922357 s2 freq +8017757 path
delay -1470
ptp4l[391.215]: master offset 1026266 s2 freq +8373792 path
delay -1470
It stays like this and does not converge.
The weird thing is, when kill ptp4l on that device and restart it again,
I get perfect values:
ptp4l[1988.969]: master offset -1 s2 freq -352 path
delay 240
ptp4l[1988.977]: master offset -2 s2 freq -355 path
delay 240
ptp4l[1989.001]: master offset -2 s2 freq -355 path
delay 240
ptp4l[1989.166]: master offset -7 s2 freq -370 path
delay 240
ptp4l[1989.174]: master offset -8 s2 freq -374 path
delay 240
ptp4l[1989.276]: master offset 4 s2 freq -338 path
delay 240
ptp4l[1989.284]: master offset 3 s2 freq -340 path
delay 240
ptp4l[1989.291]: master offset 6 s2 freq -331 path
delay 240
Furthermore, I get a lot of these messages (don't know if related):
ptp4l[422.686]: port 1: received SYNC without timestamp
ptp4l[426.874]: port 1: received DELAY_REQ without timestamp
Does anybody have an Idea what might cause this behavior and how to get
good values from the first run?
Best Regards,
Peter Fischer
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