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23.4. Using the PTP Management Client
The
PTP management client, pmc, can be used to obtain additional information from ptp4l as follows:
~]# pmc -u -b 0 'GET CURRENT_DATA_SET'
sending: GET CURRENT_DATA_SET
90e2ba.fffe.20c7f8-0 seq 0 RESPONSE MANAGMENT CURRENT_DATA_SET
stepsRemoved 1
offsetFromMaster -142.0
meanPathDelay 9310.0
~]# pmc -u -b 0 'GET TIME_STATUS_NP'
sending: GET TIME_STATUS_NP
90e2ba.fffe.20c7f8-0 seq 0 RESPONSE MANAGMENT TIME_STATUS_NP
master_offset 310
ingress_time 1361545089345029441
cumulativeScaledRateOffset +1.000000000
scaledLastGmPhaseChange 0
gmTimeBaseIndicator 0
lastGmPhaseChange 0x0000'0000000000000000.0000
gmPresent true
gmIdentity 00a069.fffe.0b552d
Setting the
-b option to zero limits the boundary to the locally running ptp4l instance. A larger boundary value will retrieve the information also from PTP nodes further from the local clock. The retrievable information includes:
stepsRemovedis the number of communication paths to the grandmaster clock.offsetFromMasterand master_offset is the last measured offset of the clock from the master in nanoseconds.meanPathDelayis the estimated delay of the synchronization messages sent from the master in nanoseconds.- if
gmPresentis true, thePTPclock is synchronized to a master, the local clock is not the grandmaster clock. gmIdentityis the grandmaster's identity.
For a full list of pmc commands, type the following as
root:
~]# pmc help
Additional information is available in the pmc(8) man page.
