I’m having some issues when running the phc2sys service: 1. Getting too big offsets (above 1000 ns, something even above 10000 ns). 2. Frequency doesn’t offset not stable (goes backward and forward between -1000 to +15000). 3. Delay seems too high (around 85000 ns) and also not stable.
My board is running as a PTP slave (running ptp4l), so I thought that maybe due to the PTP operations on the PHC, the PHC jumps too frequently (-/+500 ns), and that’s may cause the PHC offset (from the SYSTEM clock) to jumps even more frequently. So I tried to disable the PTP on the slave side, so now I’m only trying to synchronize the SYSTEM clock to the PHC, but the PTP isn’t running - so the ptp4l isn’t touching the PHC (maybe some other app is touching it?), but I still getting huge numbers when running: phc2sys -s eth0 -c CLOCK_REALTIME -O 0 -m phc2sys[100724.479]: phc offset 9710 s2 freq +16651 delay 87084 phc2sys[100725.480]: phc offset -6374 s2 freq +3494 delay 98123 phc2sys[100726.480]: phc offset 7295 s2 freq +15238 delay 85917 phc2sys[100727.481]: phc offset 504 s2 freq +10641 delay 85791 phc2sys[100728.482]: phc offset -5856 s2 freq +4438 delay 87999 phc2sys[100729.483]: phc offset -797 s2 freq +7737 delay 87708 phc2sys[100730.484]: phc offset 2084 s2 freq +10376 delay 78833 phc2sys[100731.485]: phc offset 4011 s2 freq +12926 delay 87999 phc2sys[100732.486]: phc offset 38 s2 freq +10158 delay 86291 phc2sys[100733.487]: phc offset -1026 s2 freq +9107 delay 91958 phc2sys[100734.488]: phc offset -6140 s2 freq +3690 delay 85832 phc2sys[100735.489]: phc offset 4207 s2 freq +12186 delay 88041 phc2sys[100736.490]: phc offset -3554 s2 freq +5695 delay 85623 phc2sys[100737.491]: phc offset 3789 s2 freq +11965 delay 101083 phc2sys[100738.492]: phc offset 297 s2 freq +9611 delay 85582 phc2sys[100739.493]: phc offset 1379 s2 freq +10781 delay 87875 phc2sys[100740.494]: phc offset -6069 s2 freq +3752 delay 86332 phc2sys[100741.495]: phc offset -1331 s2 freq +6669 delay 87958 phc2sys[100742.496]: phc offset 6917 s2 freq +14508 delay 88499 phc2sys[100743.497]: phc offset -2184 s2 freq +7491 delay 81374 phc2sys[100744.498]: phc offset 2693 s2 freq +11707 delay 87583 phc2sys[100745.499]: phc offset -4275 s2 freq +5553 delay 85624 phc2sys[100746.500]: phc offset -229 s2 freq +8315 delay 85541 phc2sys[100747.501]: phc offset 2908 s2 freq +11380 delay 73500 phc2sys[100748.502]: phc offset 2244 s2 freq +11588 delay 87665 phc2sys[100749.503]: phc offset -10089 s2 freq -54 delay 109915 phc2sys[100750.504]: phc offset 4548 s2 freq +11540 delay 81959 phc2sys[100751.505]: phc offset 5286 s2 freq +13641 delay 89249 phc2sys[100752.506]: phc offset -1932 s2 freq +8015 delay 80082 phc2sys[100753.507]: phc offset 3044 s2 freq +12406 delay 88624 phc2sys[100754.508]: phc offset -1080 s2 freq +9200 delay 87499 phc2sys[100755.509]: phc offset -7518 s2 freq +2441 delay 93249 phc2sys[100756.510]: phc offset 804 s2 freq +8503 delay 87000 phc2sys[100757.511]: phc offset -149 s2 freq +7793 delay 88999 phc2sys[100758.512]: phc offset 6757 s2 freq +14645 delay 85875 phc2sys[100759.513]: phc offset 4473 s2 freq +14389 delay 95998 phc2sys[100760.514]: phc offset -1140 s2 freq +10123 delay 101207 phc2sys[100761.515]: phc offset -6670 s2 freq +4257 delay 95457 phc2sys[100762.517]: phc offset -9577 s2 freq -638 delay 109792 phc2sys[100763.517]: phc offset 3410 s2 freq +9460 delay 87125 phc2sys[100764.518]: phc offset 8896 s2 freq +15961 delay 87332 phc2sys[100765.519]: phc offset -2190 s2 freq +7554 delay 84499 phc2sys[100766.520]: phc offset -3047 s2 freq +6041 delay 91291 phc2sys[100767.521]: phc offset 1301 s2 freq +9471 delay 85791 phc2sys[100768.522]: phc offset 5314 s2 freq +13869 delay 86416 *Question:* The first thing I’m concerned about is that the calculated delay is too high. It doesn’t make any sense (to me…). The second thing I’m concerned about is that maybe some other program is playing with the PHC - but how can I trace after such operations on the PHC ? Any idea what could it be ? Maybe some guidelines on what should I check and how ? *Platform:* My board is running with KSZ9477 switch (with HW timestamping support) on linux 4.19.
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