On Thu, Mar 17, 2016 at 06:20:44PM +0100, Miroslav Lichvar wrote: > FWIW, in a test I did with a single bonded interface and the L2 transport > ptp4l was able to bind to the slave interface, send and receive > packets, and synchronize the clock. I didn't have a chance to try it > with multiple interfaces and other bonding modes. Does anyone know if > it would work?
I tried the L2 transport with multiple bonded interfaces and it seems to be working nicely. It looks like bonding doesn't really have any effect on the raw sockets that ptp4l uses. They can send/receive packets even when the slave interface is not currently active. The only potential issue I see is that in bonding configurations where the MAC addresses of the slave interfaces are set to the same address, the PTP clocks have the same clock and port identities. If they were PTP masters, that would be a problem. With the slave-only option (-s) I think the worst thing that can happen is two slaves sending a delay request close to each other and accepting a mismatched delay response, which would add an error to the measured delay. As slaves randomize sending of their delay requests, this should happen rarely and when it does happen, the error will not get through the median filter, so I think this won't really be a problem. If anyone would like to try it, with the timemaster program the configuration is simple. Just list the slave interfaces for the PTP domain and enable the L2 transport, for example [ptp_domain 0] interfaces eth0 eth1 [ptp4l.conf] network_transport L2 The question is if the same approach could be used with the UDP transport. The kernel would need to allow sending and receiving packets on sockets bound to the slave interfaces and I have no idea what changes that would require. -- Miroslav Lichvar ------------------------------------------------------------------------------ Transform Data into Opportunity. Accelerate data analysis in your applications with Intel Data Analytics Acceleration Library. Click to learn more. http://pubads.g.doubleclick.net/gampad/clk?id=278785351&iu=/4140 _______________________________________________ Linuxptp-devel mailing list Linuxptp-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-devel
