On Tue, Mar 17, 2015 at 05:28:45PM +0000, Chandra Mallela wrote: > As for 'what is that supposed to achieve?', in ideal scenario, targeting > 50pbb for CDMA is what I look at. I am further trying to analyze SyncE > requirements from 1588 perspective, which seems too tough at this moment due > to OS scheduling jitter itself. > > Please correct me as appropriate and pour in your thoughts.
So 50 pbb means 50 nanoseconds. That should be attainable with a more moderate Sync rate, but it depends on your hardware time stamping resolution, etc. With SyncE, you need to hack ptp4l *not* to touch the frequency adjustment. I have some patches in the works for this, but you can change the code yourself in the mean time. Using SyncE and the default 1 Hz Sync, I have seen two nodes synchronized to within 8 nanoseconds (the clock period of those systems). So, I really, truly don't see the need for 512 Syncs per second. But if you want run that rate, then you are going to have to optimize your system, especially WRT to real time response, as I said before. Thanks, Richard ------------------------------------------------------------------------------ Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ Linuxptp-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/linuxptp-users
