On Wed, Jun 24, 2020 at 10:02:36AM -0500, Chris Caudle wrote: > On Wed, June 24, 2020 8:46 am, > linuxptp-users-requ...@lists.sourceforge.net > IIRC, the Rpi does not have > a MAC at all. > > Rasberry-Pi has a USB connected Ethernet controller. Because it is > connected via USB all the timestamping will need to be in the network > device, I don't see how software timestamping would work at all given the > 1ms jitter because of USB packet timing.
I'm not sure how it works in the HW, but the SW timestamping on a RPi 3B I used for testing was stable to few microseconds, not much worse than on real computers with NICs on PCIe. The absolute TX/RX errors were significantly larger (around 60-80 microseconds). -- Miroslav Lichvar _______________________________________________ Linuxptp-users mailing list Linuxptp-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-users
