On Tue, 2013-12-03 at 20:53 +0100, Jiri Benc wrote: > On Tue, 3 Dec 2013 20:27:46 +0100, Richard Cochran wrote: > > You mentioned that you want to implement "hot pluggable" ports on top > > of this series. Do you have anything yet? If so, please post that too, > > so we can get the big picture. > > Not yet, I'm working on it but there's still a long road ahead. My main > motivation is to support bonding (which probably sounds scarier than it > actually is), or alternatively, some other sort of automatic failover. > > I'm currently experimenting with multiple PHC support, which is needed > for the above and, perhaps more interestingly, would allow things like > boundary clock with separate NICs. Of course, for this to be fully > useful, phc2sys will need to be extended to follow ptp4l's state > machine for individual interfaces. IIRC Jake expressed interest in such > phc2sys extension, too > (http://sourceforge.net/mailarchive/message.php?msg_id=31176225). > > (I'm aware that boundary clock with separate but synchronized clocks is > kind of out of PTP spec but I think it could be done in the way that's > indistinguishable from the single clock from the other device's point > of view, which is what really matters. There will be some impact on > precision, of course.) > > Jiri >
I like this idea. I also think if we supported the "push" updates from ptp4l, where ptp4l sends data over the management interface it would enable the phc2sys to update it's internal state without requiring polling as it could update whenever it receives data on the management socket. This type of setup also enables us to support phc2sys working "out of the box" by automatically setting up the slave/master relationship so that it doesn't require manual setup which can be a little confusing. I do think that, while this is not in spec, it would be very useful for boards which don't support boundary clock due to design. Obviously there is some precision impact.. I am curious how difficult it would be to measure that. Regards, Jake ------------------------------------------------------------------------------ Sponsored by Intel(R) XDK Develop, test and display web and hybrid apps with a single code base. Download it for free now! http://pubads.g.doubleclick.net/gampad/clk?id=111408631&iu=/4140/ostg.clktrk _______________________________________________ Linuxptp-devel mailing list Linuxptp-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-devel
