On Fri, Jun 23, 2017 at 02:04:08PM -0500, John Lemonovich wrote: > I have my 2 Altera A10 kits running LinuxPTP sync'd using HW timestamping > to < 60ns using UDP connected to a non PTP switch (with not much total > traffic). I am now connecting the same 2 kits through an ExtremeNetworks > 802.1AS switch and have switched to L2 transport. After working through > some issues and finding out that transportSpecific must be set to 1 for > 802.12AS capable to be reported in the transport specific field of the > frames,
For 802.1AS, I recommend using the supplied gPTP.cfg configuration file. > I have the master and slave sync'd again, and I see now the path > delays are much lower, but my offsets never converge and kind of move all > around. Would this be a PI tuning issue, or some other issue? Sounds like a bug in the Altera A10 driver or HW. IIRC, there is no mainline Linux support for that part. Before you essentially had two identical units directly connected. Now, with the AVB switch, now there is a third party. I guess that the Altera bug is masked by symmetry in the first case. You should verify that the switch is not to blame by testing it with known good gPTP clients, for example a PC running ptp4l -f gPTP.cfg. 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
