Hello everyone,
I am running ptp4l and phc2sys with values lower than 100ns, that is, my
nodes are synchronized to the GM. It is fine until I run "stress-ng" in
my nodes (4-core systems) with 4 CPU threads at 25% of load each. ptp4l
and phc2sys have priority fifo 99 and the stress-ng process fifo 50.
Tried in Linux kernels: 4.13.0-36-generic and Preemp-RT
4.9.18-rt14-rt14. Both work badly.
When I run the load, I see a loss of sync and trying to recover it
periodically, but always losing the sync over time. This is the log of
ptp4l and phc2sys together:
phc2sys[705.021]: CLOCK_REALTIME phc offset -23 s2 freq +408525
delay 4836
ptp4l[705.089]: rms 4 max 7 freq +15635 +/- 5 delay 234 +/- 0
phc2sys[705.104]: CLOCK_REALTIME phc offset -29 s2 freq +408512
delay 4800
phc2sys[705.188]: CLOCK_REALTIME phc offset 5 s2 freq +408537
delay 4848
phc2sys[705.271]: CLOCK_REALTIME phc offset -20 s2 freq +408514
delay 4800
phc2sys[705.355]: CLOCK_REALTIME phc offset 23 s2 freq +408551
delay 4896
phc2sys[705.439]: CLOCK_REALTIME phc offset -20 s2 freq +408515
delay 4823
phc2sys[705.522]: CLOCK_REALTIME phc offset 2 s2 freq +408531
delay 4848
phc2sys[706.745]: CLOCK_REALTIME phc offset 26 s2 freq +408555
delay 4848
ptp4l[706.745]: clockcheck: clock jumped backward or running slower than
expected!
ptp4l[706.745]: port 1 (enp3s0): SLAVE to UNCALIBRATED on
SYNCHRONIZATION_FAULT
ptp4l[706.746]: port 1 (enp3s0): UNCALIBRATED to MASTER on
ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES
ptp4l[706.746]: selected local clock aabbcc.fffe.00094e as best master
ptp4l[706.746]: port 1 (enp3s0): assuming the grand master role
phc2sys[706.828]: CLOCK_REALTIME phc offset 26 s2 freq +408563
delay 4848
phc2sys[706.912]: CLOCK_REALTIME phc offset 18 s2 freq +408563
delay 4848
ptp4l[706.965]: clockcheck: clock jumped forward or running faster than
expected!
phc2sys[706.996]: CLOCK_REALTIME phc offset 12 s2 freq +408562
delay 4800
phc2sys[707.079]: CLOCK_REALTIME phc offset 24 s2 freq +408578
delay 4848
phc2sys[707.163]: CLOCK_REALTIME phc offset 61 s2 freq +408622
delay 4860
ptp4l[707.244]: selected best master clock 00049f.fffe.ef0808
ptp4l[707.244]: port 1 (enp3s0): MASTER to UNCALIBRATED on RS_SLAVE
phc2sys[707.246]: CLOCK_REALTIME phc offset 12 s2 freq +408591
delay 4848
phc2sys[707.330]: CLOCK_REALTIME phc offset 1 s2 freq +408584
delay 4848
phc2sys[707.414]: CLOCK_REALTIME phc offset -12 s2 freq +408571
delay 4812
phc2sys[707.497]: CLOCK_REALTIME phc offset 0 s2 freq +408580
delay 4836
phc2sys[707.581]: CLOCK_REALTIME phc offset 3 s2 freq +408583
delay 4848
phc2sys[707.665]: CLOCK_REALTIME phc offset -11 s2 freq +408570
delay 4848
phc2sys[707.748]: CLOCK_REALTIME phc offset 44 s2 freq +408621
delay 4848
phc2sys[707.832]: CLOCK_REALTIME phc offset 10 s2 freq +408601
delay 4800
phc2sys[707.916]: CLOCK_REALTIME phc offset -29 s2 freq +408565
delay 4836
ptp4l[707.966]: port 1 (enp3s0): UNCALIBRATED to SLAVE on
MASTER_CLOCK_SELECTED
phc2sys[707.999]: CLOCK_REALTIME phc offset -14 s2 freq +408571
delay 4848
phc2sys[708.083]: CLOCK_REALTIME phc offset -41 s2 freq +408540
delay 4812
phc2sys[708.166]: CLOCK_REALTIME phc offset -27 s2 freq +408541
delay 4812
ptp4l[708.217]: rms 9 max 18 freq +15649 +/- 20 delay 234 +/- 0
phc2sys[708.250]: CLOCK_REALTIME phc offset -20 s2 freq +408540
delay 4848
phc2sys[708.334]: CLOCK_REALTIME phc offset 1 s2 freq +408555
delay 4848
phc2sys[708.417]: CLOCK_REALTIME phc offset -28 s2 freq +408527
delay 4812
phc2sys[708.501]: CLOCK_REALTIME phc offset -10 s2 freq +408536
delay 4848
phc2sys[708.585]: CLOCK_REALTIME phc offset 2 s2 freq +408545
delay 4836
phc2sys[708.668]: CLOCK_REALTIME phc offset -5 s2 freq +408539
delay 4848
phc2sys[708.752]: CLOCK_REALTIME phc offset 7 s2 freq +408549
delay 4848
phc2sys[708.835]: CLOCK_REALTIME phc offset -25 s2 freq +408519
delay 4812
phc2sys[708.919]: CLOCK_REALTIME phc offset 5 s2 freq +408542
delay 4848
phc2sys[709.003]: CLOCK_REALTIME phc offset -26 s2 freq +408512
delay 4823
phc2sys[709.086]: CLOCK_REALTIME phc offset 1 s2 freq +408532
delay 4848
phc2sys[709.170]: CLOCK_REALTIME phc offset 12 s2 freq +408543
delay 4848
ptp4l[709.217]: rms 9 max 15 freq +15655 +/- 9 delay 234 +/- 0
phc2sys[709.254]: CLOCK_REALTIME phc offset -27 s2 freq +408507
delay 4848
phc2sys[709.337]: CLOCK_REALTIME phc offset -9 s2 freq +408517
delay 4800
phc2sys[709.421]: CLOCK_REALTIME phc offset 15 s2 freq +408539
delay 4848
phc2sys[709.504]: CLOCK_REALTIME phc offset 20 s2 freq +408548
delay 4848
phc2sys[709.588]: CLOCK_REALTIME phc offset -14 s2 freq +408520
delay 4800
phc2sys[709.672]: CLOCK_REALTIME phc offset 30 s2 freq +408560
delay 4872
phc2sys[709.755]: CLOCK_REALTIME phc offset 40 s2 freq +408579
delay 4800
phc2sys[709.839]: CLOCK_REALTIME phc offset 2 s2 freq +408553
delay 4812
phc2sys[709.922]: CLOCK_REALTIME phc offset 6 s2 freq +408558
delay 4848
phc2sys[710.006]: CLOCK_REALTIME phc offset -5 s2 freq +408548
delay 4884
phc2sys[710.090]: CLOCK_REALTIME phc offset 12 s2 freq +408564
delay 4848
phc2sys[710.173]: CLOCK_REALTIME phc offset -26 s2 freq +408529
delay 4836
ptp4l[710.218]: rms 18 max 21 freq +15628 +/- 5 delay 234 +/- 0
ptp4l[710.980]: clockcheck: clock jumped backward or running slower than
expected!
phc2sys[710.980]: CLOCK_REALTIME phc offset 8 s2 freq +408556
delay 4860
ptp4l[710.984]: port 1 (enp3s0): SLAVE to MASTER on
ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES
ptp4l[710.985]: selected local clock aabbcc.fffe.00094e as best master
ptp4l[710.985]: port 1 (enp3s0): assuming the grand master role
phc2sys[711.063]: CLOCK_REALTIME phc offset -15 s2 freq +408535
delay 4800
ptp4l[711.093]: clockcheck: clock jumped forward or running faster than
expected!
phc2sys[711.147]: CLOCK_REALTIME phc offset -5 s2 freq +408541
delay 4788
phc2sys[711.231]: CLOCK_REALTIME phc offset -20 s2 freq +408524
delay 4812
phc2sys[711.314]: CLOCK_REALTIME phc offset 56 s2 freq +408594
delay 4812
phc2sys[711.398]: CLOCK_REALTIME phc offset 34 s2 freq +408589
delay 4824
How can I solve this problem?
Any help is welcome.
Diego
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