> PPS signal is the best way. I think it is also "easy" because it removes the > guesswork.
Thanks a lot. Is there any source on how to enable the PPS output on the SDP pins and loop it back into the same NICs SDP inputs? My plan is this: 1) enable PPS output from port1 to SDP0 2) Then loopback a single wire from SDP0 of port1 to SDP0 of port2. 3) Run ts2phc for port2 in free-running mode. This should give me the fixed offset I mentioned in the first message of the thread. Also my two options are: ./ts2phc --free_running=1 -c enp2s0f0 -s enp2s0f1 ./ts2phc --free_running=1 -c enp2s0f0 -s generic but I am not sure which one is the correct one. Do I need to change my igb driver from the default one being able to enable pps input/output? Can step 1 be done by ts2phc or should I do it before running ts2phc? I tried a dry run of ts2phc and it failed with the following error: ts2phc[100692.637]: PTP_EXTTS_REQUEST2 failed: Invalid argument ts2phc[100692.637]: PTP_EXTTS_REQUEST2 failed: Invalid argument failed to arm PPS sinks ts2phc[100692.637]: PTP_EXTTS_REQUEST2 failed: Invalid argument is it because of the wrong igb driver or not having done step 1 or is it another problem altogether? Best Regards, Yash ________________________________ From: Richard Cochran <richardcoch...@gmail.com> Sent: Tuesday, June 28, 2022 4:09:04 PM To: Deshpande, Yash Cc: Miroslav Lichvar; linuxptp-users@lists.sourceforge.net Subject: Re: [Linuxptp-users] Finding the Fixed offset between two Ports of the same NIC. On Tue, Jun 28, 2022 at 01:30:32PM +0000, Deshpande, Yash wrote: > I would like to ask the second part of the question once again. I > dont wish to synchronize the two ports. I know that their relative > offset is constant as they are running on the same oscillator. This > is also reported by the ptp4l. I would just like to know this offset > without running ptp4l.Is there an easier way than PPS loopback? PPS signal is the best way. I think it is also "easy" because it removes the guess work. Thanks, Richard
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