On Thu, Aug 30, 2018 at 12:59:12AM +0200, TheMazzim M wrote: > 2) The igb driver is loaded for the NIC on this PC104. As a result, the ptp > module is loaded as well.
You can believe the ethtool output. > As I understand, this is further evidence that > hardware time stamping is supported?? Yet, the kernel (question 1) appears > not to be compliant?? What am I missing? No, your kernel configuration is okay. > After some time, I see the following "error". What is this trying to tell > me?? ... > *ptp4l[7816.367]: increasing tx_timestamp_timeout may correct this issue, > but it is likely caused by a driver bug* Well, there is a driver bug. There is a fix upstream, but your old 4.2 kernel lacks the fix. You can either upgrade your kernel or back port the fix. > 4) NOTE: As instructed by the Deployment Guide, since I would ultimately > like hardware timestamping, I also issue the phc2sys as > > *phc2sys -m -c eth3 -s CLOCK_REALTIME -w* > > Which outputs: > *phc2sys[20583.688]: p4p1 sys offset -32 s2 freq -84541 delay 8096* > *phc2sys[20584.688]: p4p1 sys offset -45 s2 freq -84564 delay 8096* > *phc2sys[20585.688]: p4p1 sys offset -32 s2 freq -84565 delay 8016* ... > What are the units of sys offset?? nanoseconds. > Does this seem like a "healthy" > situation between ptp4l and phc2sys?? Looks okay. > 5) The PTP time code is needed by custom A/D devices that time tag each > sample with the PTP time. I've discovered that they do not remove the UTC > offset (37 seconds) as reported by the PTP sync packets when I use hardware > timestamping. This problem disappears if I use software timestamping. The > manufacturer of the A/D's would look into this "bug". If I wanted to > continue to use hardware timestamps, could I force a UTC_OFFSET of 0 > seconds in the ptp4l config file.??? You can set the TAI-UTC offset to zero if that suits your needs. After all, you have a closed environment. The A/D slaves might be paying attention to the currentUtcOffsetValid field in the Announce message from your GM. By default, when ptp4l is a GM, that flag will be cleared to false. You can set it to 'true' using the GRANDMASTER_SETTINGS_NP management message. Thanks, Richard ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Linuxptp-users mailing list Linuxptp-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-users
