On Tue, Dec 08, 2015 at 11:27:29AM -0500, Brian Walsh wrote: > Sorry if this has been asked before. The archives are unreachable on > sourceforge. I keep getting an "Error 403 Read access required" when trying > to view the list archives.
Yes, SF does have issues, and I want to move away from there, eventually. In the mean time, you can use the archives on Gmane: http://news.gmane.org/gmane.comp.linux.ptp.user http://news.gmane.org/gmane.comp.linux.ptp.devel > I am having an issue with the ptp4l client and network connectivity. The > client works just fine and syncs the hardware clock on an Intel e1000 > device. Which device? > However, if anything interrupts that connectivity for a couple of > seconds the clock seems to drop the fact that it is synced to a TAI time > source with a leap second offset. It will panic that it is behind and jump > forward 36 seconds (the current leap second offset). Then a few seconds > later when connectivity is restored and resynced, it realizes it is now 36 > seconds fast and takes 20 minutes or more to work back to the correct time. IIRC, this problem is due to the fact the e1000 HW and driver requires a complete reset when the link goes down. The old time values gets lost, and the driver simply initializes the clock with the current system time. > I am able to reproduce this by temporarily blocking access to 1588 udp > ports 319 and 320 through iptables. Wait a few seconds and the clock will > jump ahead by the leap second offest. Unblock the udp ports and then the > clock begins the long process of adjusting back to the actual time. Hm, I wouldn't expect that behavior, but it does sound like the link loss symptom. > Is there a setting that I have missed or something I have over looked? The > ptp4l client does not have many options. I would think that the clock > should maintain the last known offset during the brief interruption. I think the source of the jump is not in ptp4l but rather in the driver or HW. Thanks, Richard ------------------------------------------------------------------------------ _______________________________________________ Linuxptp-users mailing list Linuxptp-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-users
