On Tue, Aug 14, 2018 at 06:50:13PM +0000, Keller, Jacob E wrote: > In hardware timestamping mode, I believe you just need a device which > supports a single clock over multiple ports.
Right. In practice, you can use the marvell link street devices, as these already have kernel support. > You can possibly use jbod mode too? I don't have any idea how much that would > impact performance though. Yes, but the performance would be poor. Another way is to synchronize separate cards by means of HW. I've made a 3-port switch using 3 Intel i210 cards whose SDP inputs/outputs are connected with a little wire. You arrange a 1-PPS from one card into others. (I think I posted an example program some time ago.) Then you run the PTP stack using the 'free_running' option. It works pretty well. HTH, 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
