Hi,
I am facing an issue (clockcheck: clock jumped forward or running faster than
expected!) when I try to sync the system clock with the phc clock:
Below are the ethtool -T of both my hardware:
Slave(PC):
ime stamping parameters for enp4s0:
Capabilities:
hardware-transmit (SOF_TIMESTAMPING_TX_HARDWARE)
software-transmit (SOF_TIMESTAMPING_TX_SOFTWARE)
hardware-receive (SOF_TIMESTAMPING_RX_HARDWARE)
software-receive (SOF_TIMESTAMPING_RX_SOFTWARE)
software-system-clock (SOF_TIMESTAMPING_SOFTWARE)
hardware-raw-clock (SOF_TIMESTAMPING_RAW_HARDWARE)
PTP Hardware Clock: 0
Hardware Transmit Timestamp Modes:
off (HWTSTAMP_TX_OFF)
on (HWTSTAMP_TX_ON)
Hardware Receive Filter Modes:
none (HWTSTAMP_FILTER_NONE)
all (HWTSTAMP_FILTER_ALL)
Master(Nvidia Xavier):
Time stamping parameters for enp4s0:
Capabilities:
hardware-transmit (SOF_TIMESTAMPING_TX_HARDWARE)
software-transmit (SOF_TIMESTAMPING_TX_SOFTWARE)
hardware-receive (SOF_TIMESTAMPING_RX_HARDWARE)
software-receive (SOF_TIMESTAMPING_RX_SOFTWARE)
software-system-clock (SOF_TIMESTAMPING_SOFTWARE)
hardware-raw-clock (SOF_TIMESTAMPING_RAW_HARDWARE)
PTP Hardware Clock: 0
Hardware Transmit Timestamp Modes:
off (HWTSTAMP_TX_OFF)
on (HWTSTAMP_TX_ON)
Hardware Receive Filter Modes:
none (HWTSTAMP_FILTER_NONE)
ptpv1-l4-sync (HWTSTAMP_FILTER_PTP_V1_L4_SYNC)
ptpv1-l4-delay-req (HWTSTAMP_FILTER_PTP_V1_L4_DELAY_REQ)
ptpv2-l4-sync (HWTSTAMP_FILTER_PTP_V2_L4_SYNC)
ptpv2-l4-delay-req (HWTSTAMP_FILTER_PTP_V2_L4_DELAY_REQ)
ptpv2-l2-sync (HWTSTAMP_FILTER_PTP_V2_L2_SYNC)
ptpv2-l2-delay-req (HWTSTAMP_FILTER_PTP_V2_L2_DELAY_REQ)
ptpv2-event (HWTSTAMP_FILTER_PTP_V2_EVENT)
the ptp4l cmd is running fine on both sides:
ptp4l[251039.089]: selected /dev/ptp0 as PTP clock
ptp4l[251039.090]: port 1: INITIALIZING to LISTENING on INIT_COMPLETE
ptp4l[251039.090]: port 0: INITIALIZING to LISTENING on INIT_COMPLETE
ptp4l[251045.327]: selected local clock 7085c2.fffe.f7f1e9 as best master
ptp4l[251052.602]: selected local clock 7085c2.fffe.f7f1e9 as best master
ptp4l[251058.243]: port 1: new foreign master 00044b.fffe.cbaa5f-1
ptp4l[251059.985]: selected local clock 7085c2.fffe.f7f1e9 as best master
ptp4l[251062.688]: selected best master clock 00044b.fffe.cbaa5f
ptp4l[251062.688]: port 1: LISTENING to UNCALIBRATED on RS_SLAVE
ptp4l[251064.910]: master offset -4494031274 s0 freq +0 path delay
1396
ptp4l[251066.021]: master offset -4494010664 s1 freq +18546 path delay
-382
ptp4l[251067.132]: master offset -8981 s2 freq +9565 path delay -382
ptp4l[251067.132]: port 1: UNCALIBRATED to SLAVE on MASTER_CLOCK_SELECTED
ptp4l[251068.243]: master offset -2603 s2 freq +13249 path delay 1396
ptp4l[251069.354]: master offset 1595 s2 freq +16666 path delay 1477
ptp4l[251070.466]: master offset 342 s2 freq +15892 path delay 3156
ptp4l[251071.577]: master offset 1682 s2 freq +17334 path delay 3051
ptp4l[251072.688]: master offset 1148 s2 freq +17305 path delay 3195
ptp4l[251073.800]: master offset 779 s2 freq +17280 path delay 3255
ptp4l[251074.911]: master offset 433 s2 freq +17168 path delay 3255
ptp4l[251076.022]: master offset 268 s2 freq +17133 path delay 3302
ptp4l[251077.133]: master offset 74 s2 freq +17019 path delay 3360
ptp4l[251078.245]: master offset -3 s2 freq +16965 path delay 3379
ptp4l[251079.356]: master offset 78 s2 freq +17045 path delay 3379
ptp4l[251080.467]: master offset 26 s2 freq +17016 path delay 3393
ptp4l[251081.578]: master offset -3 s2 freq +16995 path delay 3393
ptp4l[251082.690]: master offset -15 s2 freq +16982 path delay 3385
ptp4l[251083.801]: master offset -14 s2 freq +16978 path delay 3385
ptp4l[251084.912]: master offset 130 s2 freq +17118 path delay 3374
ptp4l[251086.023]: master offset -36 s2 freq +16991 path delay 3374
ptp4l[251087.135]: master offset -32 s2 freq +16984 path delay 3369
ptp4l[251088.245]: master offset -16 s2 freq +16991 path delay 3360
ptp4l[251089.357]: master offset 15 s2 freq +17017 path delay 3360
ptp4l[251090.468]: master offset -15 s2 freq +16992 path delay 3351
ptp4l[251091.580]: master offset 129 s2 freq +17131 path delay 3351
ptp4l[251092.691]: master offset -125 s2 freq +16916 path delay 3361
ptp4l[251093.802]: master offset -12 s2 freq +16991 path delay 3361
ptp4l[251094.913]: master offset 14 s2 freq +17014 path delay 3351
...
However the phc2sys is giving me the following error on the slave side, where
the phc clock took a big jump:
$ sudo ./phc2sys -s /dev/ptp0 -c CLOCK_REALTIME -w -m
phc2sys[251211.780]: CLOCK_REALTIME phc offset 39434682283 s0 freq -801
delay 7410
phc2sys[251212.781]: CLOCK_REALTIME phc offset 39434724040 s1 freq +40945
delay 7410
phc2sys[251213.781]: CLOCK_REALTIME phc offset 39432354542 s2 freq +100000000
delay 7420
phc2sys[251214.781]: CLOCK_REALTIME phc offset 39321261386 s2 freq +100000000
delay 6669
phc2sys[251215.782]: CLOCK_REALTIME phc offset 39210184587 s2 freq +100000000
delay 6669
phc2sys[251216.782]: CLOCK_REALTIME phc offset 39099103944 s2 freq +100000000
delay 6678
phc2sys[251217.782]: CLOCK_REALTIME phc offset 38988025910 s2 freq +100000000
delay 6669
phc2sys[251218.782]: CLOCK_REALTIME phc offset 38876945714 s2 freq +100000000
delay 6678
phc2sys[251219.782]: CLOCK_REALTIME phc offset 38765868467 s2 freq +100000000
delay 6678
phc2sys[251220.782]: CLOCK_REALTIME phc offset 38654770437 s2 freq +100000000
delay 6669
phc2sys[251221.783]: CLOCK_REALTIME phc offset 38543684871 s2 freq +100000000
delay 6678
phc2sys[251222.783]: CLOCK_REALTIME phc offset 38432605630 s2 freq +100000000
delay 6678
phc2sys[251223.783]: CLOCK_REALTIME phc offset 38321527331 s2 freq +100000000
delay 6678
phc2sys[251224.783]: CLOCK_REALTIME phc offset 38210450947 s2 freq +100000000
delay 6678
phc2sys[251225.783]: CLOCK_REALTIME phc offset 38099370862 s2 freq +100000000
delay 6669
phc2sys[251226.783]: CLOCK_REALTIME phc offset 37988290771 s2 freq +100000000
delay 6669
phc2sys[251227.783]: CLOCK_REALTIME phc offset 37877210589 s2 freq +100000000
delay 6678
phc2sys[251228.784]: CLOCK_REALTIME phc offset 37766135304 s2 freq +100000000
delay 6669
phc2sys[251229.784]: CLOCK_REALTIME phc offset 37655031231 s2 freq +100000000
delay 6660
phc2sys[251230.784]: CLOCK_REALTIME phc offset 37543917265 s2 freq +100000000
delay 6678
phc2sys[251231.785]: CLOCK_REALTIME phc offset 37432837073 s2 freq +100000000
delay 6678
phc2sys[251232.785]: CLOCK_REALTIME phc offset 37321741444 s2 freq +100000000
delay 6669
phc2sys[251233.785]: CLOCK_REALTIME phc offset 37210655961 s2 freq +100000000
delay 6678
phc2sys[251234.785]: CLOCK_REALTIME phc offset 37099579705 s2 freq +100000000
delay 6678
phc2sys[251235.785]: CLOCK_REALTIME phc offset 36988499222 s2 freq +100000000
delay 6678
phc2sys[251236.785]: CLOCK_REALTIME phc offset 36877422495 s2 freq +100000000
delay 6669
phc2sys[251237.786]: CLOCK_REALTIME phc offset 36766344850 s2 freq +100000000
delay 6678
phc2sys[251238.786]: CLOCK_REALTIME phc offset 36655236687 s2 freq +100000000
delay 6669
phc2sys[251239.786]: CLOCK_REALTIME phc offset 36544157584 s2 freq +100000000
delay 6678
phc2sys[251240.787]: CLOCK_REALTIME phc offset 36433045318 s2 freq +100000000
delay 6678
phc2sys[251241.787]: CLOCK_REALTIME phc offset 36321949422 s2 freq +100000000
delay 6669
phc2sys[251242.787]: CLOCK_REALTIME phc offset 36210862833 s2 freq +100000000
delay 6669
phc2sys[251243.787]: CLOCK_REALTIME phc offset 36099784588 s2 freq +100000000
delay 6669
phc2sys[251244.787]: CLOCK_REALTIME phc offset 35988703421 s2 freq +100000000
delay 6678
phc2sys[251245.788]: clockcheck: clock jumped forward or running faster than
expected! <-- the error
phc2sys[251245.788]: CLOCK_REALTIME phc offset 39378909599 s0 freq +100000000
delay 6678
phc2sys[251246.788]: CLOCK_REALTIME phc offset 39267830987 s2 freq -100000000
delay 6669
phc2sys[251247.793]: CLOCK_REALTIME phc offset 39359279176 s2 freq +100000000
delay 8162
phc2sys[251248.793]: CLOCK_REALTIME phc offset 39248204685 s2 freq +100000000
delay 6678
phc2sys[251248.847]: CLOCK_REALTIME phc offset 39242213151 s2 freq +100000000
delay 6678
Is the a HW limitation ? Any recommendation on how to fix this issue?
Thanks,
Wen Bin Leong
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