On Wed, Nov 04, 2015 at 01:46:52PM +0000, Shlomi Tubul wrote: > For some reason, I see spikes at clients, which are > unreasonable. Most of the time the offset is around +- 200ns, > but from time to time it jumps to more than 20 micro second.
You shouldn't have such spikes. > Looking at the code of ptp4l, I see that there are filters for > the delay but not for the offset. That is because they are not needed. > I updated the code a little it in my environment, just to see > if the offset is real. For every offset greater than 1 > microsecond, I updated it to 0. This caused the client to > synchronize better and not trying to adjust huge offsets. You made a band aid, and this papers over the problem. Why not find out the cause of those spikes? > Both server and client are running Intel I210, RH 7.1, linux ptp 1.6. I have used the i210 quite a lot, and I have never seen such spikes. Do you have a direct point to point connection? If not, probably the equipment in between is to blame. > The setup is running also other applications (Hadoop etc), so > I am not sure how much it affects. The time stamps are taken in hardware at the MAC level, and so applications should have no effect. Thanks, Richard ------------------------------------------------------------------------------ _______________________________________________ Linuxptp-devel mailing list Linuxptp-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-devel
