Hello everyone!
I am trying to use a NIC as a PTP GM with any external sync sorce. I
have a PC with a dual port NIC (82599ES 10-Gigabit SFI/SFP+) connected
to an embedded device over Ethernet. I use a SFP-to-Ethernet adapter to
translate from SFP+ to Ethernet. Both devices need to be synced but I
cannot use GPS or other external clock sources. My idea is to use the
NIC as a PTP GM and serve the embedded device with PTP. What I am not
sure about is if I need to use phc2sys to sync NIC and the physical
clock of the machine hosting the NIC? What quality of sync can I expect?
With my current configuration I have some PTP coming in but the quality
is really bad. On the embedded device I see the following:
ptp4l[2023/10/19/12:28:03]: state=2 rms 901387699 max 1000000058 freq
+1353 +/- 78 delay 20569 +/- 16
ptp4l[2023/10/19/12:28:04]: state=2 rms 1245 max 4879 freq +1213 +/-
4 delay 20539 +/- 32
ptp4l[2023/10/19/12:28:05]: state=2 rms 132 max 242 freq +1196 +/-
7 delay 20442 +/- 35
ptp4l[2023/10/19/12:28:06]: state=2 rms 1031 max 4050 freq +1158 +/-
53 delay 20427 +/- 20
ptp4l[2023/10/19/12:28:07]: state=2 rms 172 max 381 freq +1065 +/-
0 delay 20401 +/- 11
ptp4l[2023/10/19/12:28:08]: state=2 rms 69 max 153 freq +1020 +/-
13 delay 20400 +/- 16
ptp4l[2023/10/19/12:28:09]: state=2 rms 105 max 300 freq +1021 +/-
4 delay 20392 +/- 10
ptp4l[2023/10/19/12:28:10]: state=2 rms 222 max 518 freq +1020 +/-
0 delay 20436 +/- 13
ptp4l[2023/10/19/12:28:11]: state=2 rms 968245340 max 999999669 freq
+992 +/- 0 delay 20507 +/- 36
ptp4l[2023/10/19/12:28:13]: state=2 rms 433012546 max 999999740 freq
+921 +/- 28 delay 20559 +/- 31
ptp4l[2023/10/19/12:28:14]: state=2 rms 139 max 279 freq +919 +/-
2 delay 20586 +/- 34
ptp4l[2023/10/19/12:28:15]: state=2 rms 153 max 263 freq +922 +/-
4 delay 20671 +/- 22
ptp4l[2023/10/19/12:28:16]: state=2 rms 433012402 max 999999485 freq
+976 +/- 87 delay 20681 +/- 3
ptp4l[2023/10/19/12:28:18]: state=2 rms 968245358 max 999999677 freq
+1084 +/- 110 delay 20724 +/- 18
ptp4l[2023/10/19/12:28:19]: state=2 rms 313 max 566 freq +803 +/-
3 delay 20727 +/- 16
Is this because I don't have an external clock source or is it about how
I have configured the PTP GM? I have uploaded both configs to pastebin,
you'll find the pastes here:
PTP GM: https://pastebin.com/9cRBEZZn
PTP Clien emb. device: https://pastebin.com/RtECRXCe
I cannot adjust the config on the embedded device but I can adjust the
config on the PTP GM. But unfortunately, I am not sure what I am doing
wrong. I would really appreciate any help! Thanks in advance!
Best regards
Nils
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