Clock class via PMC call is blocking  the event thread for 2 secs on failure.This is causing event channel not able to process other events .

Apply GM PTP config and  grep logs for dpll\.go and event\.go and see following error 
1. grep for event.go
E0810 01:25:09.493977 2989458 event.go:274] failed to updateClockClass: failed to update GRANDMASTER_SETTINGS_NP: expect: timer expired after 2 seconds

2. grep dpll.go 
E0810 01:24:55.735404 2989458 dpll.go:541] Failed to send DPLL event

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clock class updates should be send to jobs to process without blocking other routins