topic Re: ptp4l issue on LS1028ARDB in Layerscape

ptp4l issue on LS1028ARDB

ceroone — Tue, 17 Aug 2021 09:12:39 GMT

Hello,

I am trying to synchronize some NXP equipment using ptp4l. It works fine for all the other boards, but I am facing a problem with the LS1028ARDB.

I run the following command :

# ptp4l -i swp0 -i swp1 -f /etc/ptp4l_cfg/gPTP.cfg

But it returns this error (besides the fact that the offsets remain very high):

ptp4l[xxxx.xxx]: clockcheck: clock jumped backward or running slower than expected!

Can you help me to identify what is the problem there?

Thank you.

cerrone

You will find the gPTP .cfg file attached below.

Re: ptp4l issue on LS1028ARDB

andrei_skok — Wed, 18 Aug 2021 15:27:44 GMT

In gPTP.cfg, please comment out the neighborPropDelayThresh line
# neighborPropDelayThresh 800

and let us know how you get on.

Re: ptp4l issue on LS1028ARDB

ceroone — Thu, 19 Aug 2021 07:21:26 GMT

In fact it was allready commented, I forgot to indicate it in my previous message.

Another thing that I forgot to say: before lauching ptp4l on each board, I also reset the PTP Hardware Clock. On the LS1028ARDB, the exact command that I run is:

# phc_ctl /dev/ptp1 set 0; ptp4l -i swp0 -i swp1 -f /etc/ptp4l_cfg/gPTP.cfg -m

(I reset the PHC on every board, but the LS1028ARDB is the only one on which I get the error message...)

So could this phc_ctl command be the cause of the problem?

ceroone

Re: ptp4l issue on LS1028ARDB

andrei_skok — Thu, 19 Aug 2021 13:40:48 GMT

Could you try adding 'step_threshold 0.00002' setting to the gPTP.cfg file pls and let us know whether the situation is improved ?
(for more info ref: https://github.com/openil/linuxptp/issues/10)

> So could this phc_ctl command be the cause of the problem ?
It seems that a large change in PHC is difficult to tune for, so these gPTP.cfg tunings should help.

Re: ptp4l issue on LS1028ARDB

ceroone — Wed, 25 Aug 2021 11:21:47 GMT

Adding "step_threshold 0.00002" seems to solve the problem indeed.

Thank you !

Re: ptp4l issue on LS1028ARDB

justdomyself — Sat, 12 Aug 2023 12:05:07 GMT

Hi:

my slave device use cmd :

"ptp4l -f ptp4l.conf -i eth0 -H -m -s"

I modify ptp4l.conf file:

change step_threshold value from defaut 0 to 0.00002,

but the error message is still happened?

Re: ptp4l issue on LS1028ARDB

justdomyself — Sat, 12 Aug 2023 12:34:41 GMT

my test step is :

1、start the master run ptp4l and phc2sys

2、start the slave device , run ptp4l and phc2sys

then slave system clock is sync sucsess by master.， all this step is run ok。

then i use date 081515302023 to change master's time ，the time chagne maybe 1 minutes or more larger, maybe 1 hour or one day.

then the slave device print error message:

clockcheck: clock jumped forward or running faster than expected!

So my question is ；

1、the ptp can't chagne master's time too large, It do not suporrt? My test method is wrong 。

(I do this is want to confirm: the slave's time can change with the slave's time)

2、the cmd I use i not corret, or the confiuge is not correct? I use date cmd to change master's time

so large is ok, there is no problem?

can you help me anser my question ,thank you !

Re: ptp4l issue on LS1028ARDB

justdomyself — Sat, 12 Aug 2023 12:35:40 GMT

my test step is :

1、start the master run ptp4l and phc2sys

2、start the slave device , run ptp4l and phc2sys

then slave system clock is sync sucsess by master.， all this step is run ok。

then i use date 081515302023 to change master's time ，the time chagne maybe 1 minutes or more larger, maybe 1 hour or one day.

then the slave device print error message:

clockcheck: clock jumped forward or running faster than expected!

So my question is ；

1、the ptp can't chagne master's time too large, It do not suporrt? My test method is wrong 。

(I do this is want to confirm: the slave's time can change with the slave's time)

2、the cmd I use i not corret, or the confiuge is not correct? I use date cmd to change master's time

so large is ok, there is no problem?

can you help me anser my question ,thank you !