> -----Original Message----- > From: Diego García Prieto <gprie...@unican.es> > Sent: Wednesday, April 21, 2021 9:25 AM > To: Richard Cochran <richardcoch...@gmail.com> > Cc: linuxptp-users@lists.sourceforge.net > Subject: Re: [Linuxptp-users] Loss of sync with 25% of CPU load > > Hello, > > It does not work. Done: stress-ng (fifo 50), ptp4l (fifo 99), > phc2sys(fifo 99), kworker of the cores where ptp4l and phc2sys run (fifo > 99). it still breaks the ptp4l synchronization when stress-ng boots up. > I do not believe that it has not happend to others. > > Some new advice? > >
You mentioned you were using igb. I believe that driver still relies on a work queue task to handle the Tx timestamps, as well as overflow check. If your device needs the overflow check, and it gets skipped that could result in very wild incorrect timestamping results. However, I do not believe that is the case with the i210 so I think that can be ruled out. I am not sure what else could be causing clock instability or variable delay in the packet transmit and receive handling within the hardware to the point that it impacts the PTP calculation.. Thanks, Jake > Thank you for reading, > > Diego > > El 07/04/2021 a las 17:04, Richard Cochran escribió: > > On Wed, Apr 07, 2021 at 11:38:55AM +0200, Diego García Prieto wrote: > > > >> I would like to know if I can stablish somehow a deadline to the ptp4l > >> protocol to avoid other threads run before it. I think that whereby I can > >> avoid the loss of syncronization. What do you think with respect to it? > > IOW, give it higher sched_fifo priority than stress-ng. > > > > Also, depending on your network load, watch out for stress-ng starving > > the networking stack (by keeping ksoftirqd from running). > > > > Also, watch out for stress-ng starving kworker threads (if your MAC > > driver uses kwork to deliver Tx time stamps). > > > > HTH, > > Richard > > > _______________________________________________ > Linuxptp-users mailing list > Linuxptp-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/linuxptp-users _______________________________________________ Linuxptp-users mailing list Linuxptp-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-users
