On Fri, Jul 28, 2017 at 10:31:41PM +0100, bruce bushby wrote:
> I tried running many combinations of "ptp4l" , at no point do I ever see
> PTP "offset from master" messages.

Looks like no PTP Announce messages are arriving.  You should check with
wireshark or tcpdump.
 
> I then installed and ran "ptpd2"  version 2.3.1-2 and immediately I get log
> updates showing "offset from master"

Sure, with old fashioned BSD SW loopback time stamping, it works.
 
> What is the diference between "ptpd2" and "ptp4l" ?

IIRC, ptpd2 2.3.1 doesn't support any of the current Linux time
stamping or clock APIs.
 
> Are there any known issues with ptp4l and ConnectX-3 cards ?

Sorry, I don't know.

HTH,
Richard

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