Hi all!
In "Automotive Ethernet AVB Functional and Interoperability Specification" https://avnu.org/wp-content/uploads/2014/05/Auto-Ethernet-AVB-Func-Interop-Spec_v1.6.pdf there is requirement "6.2.2 Persistent gPTP values". I would like to implement the persistent neighborPropDelay which can speed up initial synchronization time. Checking filtered neighborPropDelay is quite easy: pmc -u -t1 -b 0 "get PORT_DATA_SET" | grep peerMeanPathDelay The hard part is passing the stored value to ptp4l on startup. Well, it turned out that this is hard, because initially I found --initial_delay parameter which should just do the trick. Unfortunately, it doesn't work in automotive profile. In ptp4l source I found that the only code path the parameter is used is related to BCMA algorithm which is disabled in automotive profile. Did I just found a bug? Or there is other way to pass the initial path delay to ptp4? I know, that I could have speed up initial synchronization time by forcing faster PDelayReq sending --logMinPdelayReqInterval=-3 but unfortunately this is not allowed by automotive specification -- see 6.2.6 Required Values for gPTP. Best Regards, Marcin Miklas
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