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  1. OpenShift Bugs
  2. OCPBUGS-73795

4.21 PTP T-BC Clock Class prematurely reported 6 before other processes locked

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    • x86_64
    • QA
    • 2026-Feb-16: Waiting on merge
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    • Bug Fix
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      Before this update, when the PTP operator monitored the digital phase-locked loop (DPLL) offset, and the DPLL reached a steady state, the offset value could be temporarily below the threshold to be considered locked because of the high variability of the offset. As a consequence, the PTP boundary clock (T-BC) would announce its clock class before the `ptp4l` program and the DPLL reached a locked state. With this release, clock class decisions are started only after a minimum number of samples. As a result, the clock class is announced after the DPLL is stabilized.


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      Before this update, when the PTP operator monitored the digital phase-locked loop (DPLL) offset, and the DPLL reached a steady state, the offset value could be temporarily below the threshold to be considered locked because of the high variability of the offset. As a consequence, the PTP boundary clock (T-BC) would announce its clock class before the `ptp4l` program and the DPLL reached a locked state. With this release, clock class decisions are started only after a minimum number of samples. As a result, the clock class is announced after the DPLL is stabilized.
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      Description of problem:

          Clock Class 6 is reported prematurely before other PTP component services have locked

      Version-Release number of selected component (if applicable):

      4.21.0-202601101619    

      How reproducible:

      100%

      Steps to Reproduce:

      1. Perform a reboot
2. Wait & probe the logs & metrics    

      Actual results:

      Within Daemon logs         
-------------          
 gm.ClockClass                         6

Within Metrics
-------------
# HELP openshift_ptp_clock_class 6 = Locked, 7 = PRC unlocked in-spec, 52/187 = PRC unlocked out-of-spec, 135 = T-BC holdover in-spec, 165 = T-BC holdover out-of-spec, 248 = Default, 255 = Slave Only Clock
# TYPE openshift_ptp_clock_class gauge
openshift_ptp_clock_class{config="ptp4l.1.config",node="helix65.lab.eng.rdu2.redhat.com",process="ptp4l"} 6
# HELP openshift_ptp_clock_state 0 = FREERUN, 1 = LOCKED, 2 = HOLDOVER
# TYPE openshift_ptp_clock_state gauge
openshift_ptp_clock_state{iface="CLOCK_REALTIME",node="helix65.lab.eng.rdu2.redhat.com",process="phc2sys"} 1
openshift_ptp_clock_state{iface="ens1fx",node="helix65.lab.eng.rdu2.redhat.com",process="dpll"} 1
openshift_ptp_clock_state{iface="ens1fx",node="helix65.lab.eng.rdu2.redhat.com",process="ts2phc"} 1
openshift_ptp_clock_state{iface="ens2fx",node="helix65.lab.eng.rdu2.redhat.com",process="T-BC"} 0
openshift_ptp_clock_state{iface="ens2fx",node="helix65.lab.eng.rdu2.redhat.com",process="dpll"} 0
openshift_ptp_clock_state{iface="ens2fx",node="helix65.lab.eng.rdu2.redhat.com",process="ptp4l"} 1
openshift_ptp_clock_state{iface="ens2fx",node="helix65.lab.eng.rdu2.redhat.com",process="ts2phc"} 0

      Expected results:

      Additional info:

              micosta@redhat.com Michele Tomaso Costa
              rh-ee-dpopsuev Daniel Popsuevich
              Daniel Popsuevich Daniel Popsuevich
              Tami Love Tami Love
              Daniel Popsuevich, Yang Liu
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                Created:
                Updated:
                Resolved: