Hi Richard,
thanks for your help!
>> The ptp hardware clock seems to be adjusted correct but with phc2sys i can't
>> set the RTC on the same value as the PHC. It is 36 seconds away like TAI-UTC.
>
>The RTC should *not* have the same value as the PHC. The RTC uses the
>UTC timescale, but the PHC uses TAI.
>
>BTW, your nodes all have TAI-UTC = 35, not the current 36. (This
>shows that you are using some version prior to 1.6.) If you want to
>have the correct offset, use the "set GRANDMASTER_SETTINGS_NP" pmc
>command.
>
>> set the RTC on the same value as the PHC. It is 36 seconds away like TAI-UTC.
>
>The RTC should *not* have the same value as the PHC. The RTC uses the
>UTC timescale, but the PHC uses TAI.
>
>BTW, your nodes all have TAI-UTC = 35, not the current 36. (This
>shows that you are using some version prior to 1.6.) If you want to
>have the correct offset, use the "set GRANDMASTER_SETTINGS_NP" pmc
>command.
>
Thanks for the hint, i have seen the master is old with 1.4 and the slaves have the new version
with 1.6
>> Master:
>> ptp4l -2 -i eth0 -p /dev/ptp0 -m
>> phc2sys -s eth0 -c CLOCK_REALTIME -w -m
>> RTC: Wed Jun 8 10:34:27 2016 0.000000 seconds
>> PHC: 2016-06-08 10:35:02.316598760
>
>On the master, you are adjusting your CLOCK_REALTIME to follow the PHC
>time. But what is setting the PHC time? Maybe you reversed the -s
>and -c flags, but I don't know your intention.
>
I use on the slave side the ptp timestamp with high accuracy for logging data,
parallel i want to capture some wireshark frames with tcpdump.
tcpdump uses the RTC so i'm not able to see directly the associated
timestamps of PTP and RTC.
This is the reason why i want to have the same time at PHC and RTC.
Is this possible?
>> Slave1:
>> ptp4l -i eth0 -p /dev/ptp0 -f /etc/linuxptp/default.cfg -s -m
>> phc2sys -s eth0 -c CLOCK_REALTIME -w -q -m
>> RTC: Wed Jun 8 10:34:25 2016 0.000000 seconds
>> PHC: 2016-06-08 10:35:00.084961211
>
>> Slave2:
>> ptp4l -i eth0 -p /dev/ptp0 -f /etc/linuxptp/default.cfg -s -m
>> phc2sys -s eth0 -c CLOCK_REALTIME -w -q -m
>> RTC: Wed Jun 8 10:34:29 2016 0.000000 seconds
>> PHC: 2016-06-08 10:35:04.220653446
>
>> What am I doing wrong?
>
>The slaves are configured to adjust their CLOCK_REALTIME (UTC) to
>follow the PHC (TAI). The master gives the slaves the TAI time and
>tells them that TAI-UTC=35. Then, phc2sys sets the system clock, and
>you can see the 35 second offset.
>
>So, there is nothing wrong with the slaves.
>
>HTH,
DSP
------------------------------------------------------------------------------ What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic patterns at an interface-level. Reveals which users, apps, and protocols are consuming the most bandwidth. Provides multi-vendor support for NetFlow, J-Flow, sFlow and other flows. Make informed decisions using capacity planning reports. https://ad.doubleclick.net/ddm/clk/305295220;132659582;e
_______________________________________________ Linuxptp-users mailing list Linuxptp-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-users
