LinuxPTP synchronisation drifts when starting gnb

[jshacke]

I'm having an issue with our 7.2 configuration using Benetel 650 and FibroLAN RX GM Switch; where upon starting the gnb my ptp4l and phc2sys start to fluctuate wildly. It doesn't appear that the 650 is broadcasting, and I cannot see the network on UE and no C/U plane traffic is coming (from RU logs)

Has anyone had any experience with this?

[VikrantDigiCat]

Hi @jshacke
can you please check below parameters and their corresponding values in the ptp config file that you are using?
domainNumber 24
tx_timestamp_timeout 100

Though im still struggling to get my srsRAN system to work but i also had several issues in getting PTP to work in the first place.
Let me know if this helps.

[jshacke]

@VikrantDigiCat Thanks for getting in touch, domainNumber was already set to 24, changed my tx_timestamp_timeout from 20 to 100 as per your suggestion but rms didn't improve. RMS values fluctuate between 30 to 80. I have attached my linuxptp config file for reference.

default.txt

[VikrantDigiCat]

@jshacke your config looks ok. Here is mine, in case it helps.
default.txt

Are you having issue on ORU or gNodeB regarding ptp sync?

[VikrantDigiCat]

@jshacke below is the output of my ptp4l/phc2sys running as service in the background. I'm using Falcon RX812 as the gM.

May 28 09:35:35 lon5g-sp-33 ptp4l[94065]: ptp4l[71485.930]: rms    2 max    4 freq  -6671 +/-   3 delay    12 +/-   1
May 28 09:35:35 lon5g-sp-33 ptp4l: [71485.930] rms    2 max    4 freq  -6671 +/-   3 delay    12 +/-   1
May 28 09:35:35 lon5g-sp-33 phc2sys[1029]: phc2sys[71486.021]: CLOCK_REALTIME phc offset        -4 s2 freq  +12355 delay    565
May 28 09:35:35 lon5g-sp-33 phc2sys: [71486.021] CLOCK_REALTIME phc offset        -4 s2 freq  +12355 delay    565
May 28 09:35:35 lon5g-sp-33 phc2sys[1029]: phc2sys[71486.147]: CLOCK_REALTIME phc offset        25 s2 freq  +12383 delay    511
May 28 09:35:35 lon5g-sp-33 phc2sys: [71486.147] CLOCK_REALTIME phc offset        25 s2 freq  +12383 delay    511
May 28 09:35:35 lon5g-sp-33 phc2sys[1029]: phc2sys[71486.272]: CLOCK_REALTIME phc offset        14 s2 freq  +12379 delay    504
May 28 09:35:35 lon5g-sp-33 phc2sys: [71486.272] CLOCK_REALTIME phc offset        14 s2 freq  +12379 delay    504
May 28 09:35:35 lon5g-sp-33 phc2sys[1029]: phc2sys[71486.397]: CLOCK_REALTIME phc offset       -18 s2 freq  +12352 delay    557
May 28 09:35:35 lon5g-sp-33 phc2sys: [71486.397] CLOCK_REALTIME phc offset       -18 s2 freq  +12352 delay    557
May 28 09:35:36 lon5g-sp-33 phc2sys[1029]: phc2sys[71486.522]: CLOCK_REALTIME phc offset        15 s2 freq  +12379 delay    512
May 28 09:35:36 lon5g-sp-33 phc2sys: [71486.522] CLOCK_REALTIME phc offset        15 s2 freq  +12379 delay    512
May 28 09:35:36 lon5g-sp-33 phc2sys[1029]: phc2sys[71486.648]: CLOCK_REALTIME phc offset       -17 s2 freq  +12352 delay    561
May 28 09:35:36 lon5g-sp-33 phc2sys: [71486.648] CLOCK_REALTIME phc offset       -17 s2 freq  +12352 delay    561
May 28 09:35:36 lon5g-sp-33 phc2sys[1029]: phc2sys[71486.773]: CLOCK_REALTIME phc offset       -12 s2 freq  +12352 delay    562
May 28 09:35:36 lon5g-sp-33 phc2sys: [71486.773] CLOCK_REALTIME phc offset       -12 s2 freq  +12352 delay    562
May 28 09:35:36 lon5g-sp-33 phc2sys[1029]: phc2sys[71486.898]: CLOCK_REALTIME phc offset        -8 s2 freq  +12352 delay    562
May 28 09:35:36 lon5g-sp-33 phc2sys: [71486.898] CLOCK_REALTIME phc offset        -8 s2 freq  +12352 delay    562
May 28 09:35:36 lon5g-sp-33 phc2sys[1029]: phc2sys[71487.023]: CLOCK_REALTIME phc offset        -4 s2 freq  +12354 delay    556
May 28 09:35:36 lon5g-sp-33 phc2sys: [71487.023] CLOCK_REALTIME phc offset        -4 s2 freq  +12354 delay    556
May 28 09:35:36 lon5g-sp-33 ptp4l[94065]: ptp4l[71487.055]: rms    1 max    2 freq  -6671 +/-   2 delay    13 +/-   1
May 28 09:35:36 lon5g-sp-33 ptp4l: [71487.055] rms    1 max    2 freq  -6671 +/-   2 delay    13 +/-   1
May 28 09:35:36 lon5g-sp-33 phc2sys[1029]: phc2sys[71487.149]: CLOCK_REALTIME phc offset        -5 s2 freq  +12351 delay    561
May 28 09:35:36 lon5g-sp-33 phc2sys: [71487.149] CLOCK_REALTIME phc offset        -5 s2 freq  +12351 delay    561
May 28 09:35:36 lon5g-sp-33 phc2sys[1029]: phc2sys[71487.274]: CLOCK_REALTIME phc offset        30 s2 freq  +12385 delay    524
May 28 09:35:36 lon5g-sp-33 phc2sys: [71487.274] CLOCK_REALTIME phc offset        30 s2 freq  +12385 delay    524
May 28 09:35:36 lon5g-sp-33 phc2sys[1029]: phc2sys[71487.399]: CLOCK_REALTIME phc offset        12 s2 freq  +12376 delay    562
May 28 09:35:36 lon5g-sp-33 phc2sys: [71487.399] CLOCK_REALTIME phc offset        12 s2 freq  +12376 delay    562
May 28 09:35:37 lon5g-sp-33 phc2sys[1029]: phc2sys[71487.524]: CLOCK_REALTIME phc offset        -5 s2 freq  +12362 delay    565
May 28 09:35:37 lon5g-sp-33 phc2sys: [71487.524] CLOCK_REALTIME phc offset        -5 s2 freq  +12362 delay    565
May 28 09:35:37 lon5g-sp-33 phc2sys[1029]: phc2sys[71487.650]: CLOCK_REALTIME phc offset        10 s2 freq  +12376 delay    557
May 28 09:35:37 lon5g-sp-33 phc2sys: [71487.650] CLOCK_REALTIME phc offset        10 s2 freq  +12376 delay    557
May 28 09:35:37 lon5g-sp-33 phc2sys[1029]: phc2sys[71487.775]: CLOCK_REALTIME phc offset        -2 s2 freq  +12367 delay    558
May 28 09:35:37 lon5g-sp-33 phc2sys: [71487.775] CLOCK_REALTIME phc offset        -2 s2 freq  +12367 delay    558
May 28 09:35:37 lon5g-sp-33 phc2sys[1029]: phc2sys[71487.920]: CLOCK_REALTIME phc offset        27 s2 freq  +12395 delay    518
May 28 09:35:37 lon5g-sp-33 phc2sys: [71487.920] CLOCK_REALTIME phc offset        27 s2 freq  +12395 delay    518
May 28 09:35:37 lon5g-sp-33 phc2sys[1029]: phc2sys[71488.046]: CLOCK_REALTIME phc offset        -1 s2 freq  +12375 delay    557
May 28 09:35:37 lon5g-sp-33 phc2sys: [71488.046] CLOCK_REALTIME phc offset        -1 s2 freq  +12375 delay    557
May 28 09:35:37 lon5g-sp-33 phc2sys[1029]: phc2sys[71488.171]: CLOCK_REALTIME phc offset        -9 s2 freq  +12367 delay    561
May 28 09:35:37 lon5g-sp-33 phc2sys: [71488.171] CLOCK_REALTIME phc offset        -9 s2 freq  +12367 delay    561
May 28 09:35:37 lon5g-sp-33 ptp4l[94065]: ptp4l[71488.193]: rms    3 max    5 freq  -6677 +/-   2 delay    14 +/-   1
May 28 09:35:37 lon5g-sp-33 ptp4l: [71488.193] rms    3 max    5 freq  -6677 +/-   2 delay    14 +/-   1
May 28 09:35:37 lon5g-sp-33 phc2sys[1029]: phc2sys[71488.296]: CLOCK_REALTIME phc offset        -3 s2 freq  +12370 delay    561
May 28 09:35:37 lon5g-sp-33 phc2sys: [71488.296] CLOCK_REALTIME phc offset        -3 s2 freq  +12370 delay    561
May 28 09:35:37 lon5g-sp-33 phc2sys[1029]: phc2sys[71488.421]: CLOCK_REALTIME phc offset        21 s2 freq  +12394 delay    501
May 28 09:35:37 lon5g-sp-33 phc2sys: [71488.421] CLOCK_REALTIME phc offset        21 s2 freq  +12394 delay    501
May 28 09:35:38 lon5g-sp-33 phc2sys[1029]: phc2sys[71488.547]: CLOCK_REALTIME phc offset         1 s2 freq  +12380 delay    558
May 28 09:35:38 lon5g-sp-33 phc2sys: [71488.547] CLOCK_REALTIME phc offset         1 s2 freq  +12380 delay    558
May 28 09:35:38 lon5g-sp-33 phc2sys[1029]: phc2sys[71488.672]: CLOCK_REALTIME phc offset         0 s2 freq  +12379 delay    558
May 28 09:35:38 lon5g-sp-33 phc2sys: [71488.672] CLOCK_REALTIME phc offset         0 s2 freq  +12379 delay    558
May 28 09:35:38 lon5g-sp-33 phc2sys[1029]: phc2sys[71488.797]: CLOCK_REALTIME phc offset       -11 s2 freq  +12368 delay    561
May 28 09:35:38 lon5g-sp-33 phc2sys: [71488.797] CLOCK_REALTIME phc offset       -11 s2 freq  +12368 delay    561
May 28 09:35:38 lon5g-sp-33 phc2sys[1029]: phc2sys[71488.922]: CLOCK_REALTIME phc offset        16 s2 freq  +12392 delay    522
May 28 09:35:38 lon5g-sp-33 phc2sys: [71488.922] CLOCK_REALTIME phc offset        16 s2 freq  +12392 delay    522
May 28 09:35:38 lon5g-sp-33 phc2sys[1029]: phc2sys[71489.048]: CLOCK_REALTIME phc offset       -13 s2 freq  +12368 delay    560
May 28 09:35:38 lon5g-sp-33 phc2sys: [71489.048] CLOCK_REALTIME phc offset       -13 s2 freq  +12368 delay    560
May 28 09:35:38 lon5g-sp-33 phc2sys[1029]: phc2sys[71489.173]: CLOCK_REALTIME phc offset       -10 s2 freq  +12367 delay    561
May 28 09:35:38 lon5g-sp-33 phc2sys: [71489.173] CLOCK_REALTIME phc offset       -10 s2 freq  +12367 delay    561
May 28 09:35:38 lon5g-sp-33 phc2sys[1029]: phc2sys[71489.298]: CLOCK_REALTIME phc offset       -14 s2 freq  +12360 delay    561
May 28 09:35:38 lon5g-sp-33 phc2sys: [71489.298] CLOCK_REALTIME phc offset       -14 s2 freq  +12360 delay    561
May 28 09:35:38 lon5g-sp-33 ptp4l[94065]: ptp4l[71489.312]: rms    2 max    4 freq  -6673 +/-   3 delay    14 +/-   1
May 28 09:35:38 lon5g-sp-33 ptp4l: [71489.312] rms    2 max    4 freq  -6673 +/-   3 delay    14 +/-   1
May 28 09:35:38 lon5g-sp-33 phc2sys[1029]: phc2sys[71489.423]: CLOCK_REALTIME phc offset        25 s2 freq  +12395 delay    521
May 28 09:35:38 lon5g-sp-33 phc2sys: [71489.423] CLOCK_REALTIME phc offset        25 s2 freq  +12395 delay    521
May 28 09:35:39 lon5g-sp-33 phc2sys[1029]: phc2sys[71489.549]: CLOCK_REALTIME phc offset         3 s2 freq  +12380 delay    559
May 28 09:35:39 lon5g-sp-33 phc2sys: [71489.549] CLOCK_REALTIME phc offset         3 s2 freq  +12380 delay    559
May 28 09:35:39 lon5g-sp-33 phc2sys[1029]: phc2sys[71489.674]: CLOCK_REALTIME phc offset        -5 s2 freq  +12373 delay    561
May 28 09:35:39 lon5g-sp-33 phc2sys: [71489.674] CLOCK_REALTIME phc offset        -5 s2 freq  +12373 delay    561
May 28 09:35:39 lon5g-sp-33 phc2sys[1029]: phc2sys[71489.799]: CLOCK_REALTIME phc offset       -18 s2 freq  +12358 delay    565
May 28 09:35:39 lon5g-sp-33 phc2sys: [71489.799] CLOCK_REALTIME phc offset       -18 s2 freq  +12358 delay    565
May 28 09:35:39 lon5g-sp-33 phc2sys[1029]: phc2sys[71489.924]: CLOCK_REALTIME phc offset       -16 s2 freq  +12355 delay    561
May 28 09:35:39 lon5g-sp-33 phc2sys: [71489.924] CLOCK_REALTIME phc offset       -16 s2 freq  +12355 delay    561
May 28 09:35:39 lon5g-sp-33 phc2sys[1029]: phc2sys[71490.050]: CLOCK_REALTIME phc offset        -9 s2 freq  +12357 delay    561
May 28 09:35:39 lon5g-sp-33 phc2sys: [71490.050] CLOCK_REALTIME phc offset        -9 s2 freq  +12357 delay    561
May 28 09:35:39 lon5g-sp-33 phc2sys[1029]: phc2sys[71490.175]: CLOCK_REALTIME phc offset       -11 s2 freq  +12353 delay    561
May 28 09:35:39 lon5g-sp-33 phc2sys: [71490.175] CLOCK_REALTIME phc offset       -11 s2 freq  +12353 delay    561
May 28 09:35:39 lon5g-sp-33 phc2sys[1029]: phc2sys[71490.340]: CLOCK_REALTIME phc offset        19 s2 freq  +12379 delay    519
May 28 09:35:39 lon5g-sp-33 phc2sys: [71490.340] CLOCK_REALTIME phc offset        19 s2 freq  +12379 delay    519
May 28 09:35:39 lon5g-sp-33 ptp4l[94065]: ptp4l[71490.429]: rms    1 max    3 freq  -6675 +/-   2 delay    14 +/-   1
May 28 09:35:39 lon5g-sp-33 ptp4l: [71490.429] rms    1 max    3 freq  -6675 +/-   2 delay    14 +/-   1
May 28 09:35:39 lon5g-sp-33 phc2sys[1029]: phc2sys[71490.466]: CLOCK_REALTIME phc offset         5 s2 freq  +12371 delay    566
May 28 09:35:39 lon5g-sp-33 phc2sys: [71490.466] CLOCK_REALTIME phc offset         5 s2 freq  +12371 delay    566
May 28 09:35:40 lon5g-sp-33 phc2sys[1029]: phc2sys[71490.611]: CLOCK_REALTIME phc offset         1 s2 freq  +12368 delay    562
May 28 09:35:40 lon5g-sp-33 phc2sys: [71490.611] CLOCK_REALTIME phc offset         1 s2 freq  +12368 delay    562
May 28 09:35:40 lon5g-sp-33 phc2sys[1029]: phc2sys[71490.736]: CLOCK_REALTIME phc offset        19 s2 freq  +12387 delay    518
May 28 09:35:40 lon5g-sp-33 phc2sys: [71490.736] CLOCK_REALTIME phc offset        19 s2 freq  +12387 delay    518
May 28 09:35:40 lon5g-sp-33 phc2sys[1029]: phc2sys[71490.862]: CLOCK_REALTIME phc offset        13 s2 freq  +12386 delay    517
May 28 09:35:40 lon5g-sp-33 phc2sys: [71490.862] CLOCK_REALTIME phc offset        13 s2 freq  +12386 delay    517
May 28 09:35:40 lon5g-sp-33 phc2sys[1029]: phc2sys[71490.987]: CLOCK_REALTIME phc offset        18 s2 freq  +12395 delay    521
May 28 09:35:40 lon5g-sp-33 phc2sys: [71490.987] CLOCK_REALTIME phc offset        18 s2 freq  +12395 delay    521
May 28 09:35:40 lon5g-sp-33 phc2sys[1029]: phc2sys[71491.112]: CLOCK_REALTIME phc offset        18 s2 freq  +12401 delay    519
May 28 09:35:40 lon5g-sp-33 phc2sys: [71491.112] CLOCK_REALTIME phc offset        18 s2 freq  +12401 delay    519
May 28 09:35:40 lon5g-sp-33 phc2sys[1029]: phc2sys[71491.237]: CLOCK_REALTIME phc offset        23 s2 freq  +12411 delay    510
May 28 09:35:40 lon5g-sp-33 phc2sys: [71491.237] CLOCK_REALTIME phc offset        23 s2 freq  +12411 delay    510
May 28 09:35:40 lon5g-sp-33 phc2sys[1029]: phc2sys[71491.363]: CLOCK_REALTIME phc offset         8 s2 freq  +12403 delay    517
May 28 09:35:40 lon5g-sp-33 phc2sys: [71491.363] CLOCK_REALTIME phc offset         8 s2 freq  +12403 delay    517
May 28 09:35:41 lon5g-sp-33 phc2sys[1029]: phc2sys[71491.508]: CLOCK_REALTIME phc offset       -32 s2 freq  +12365 delay    559
May 28 09:35:41 lon5g-sp-33 phc2sys: [71491.508] CLOCK_REALTIME phc offset       -32 s2 freq  +12365 delay    559