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
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