On 1/7/2021 2:58 PM, Ankur Sharma wrote: > Hi, > > We are using PTP4L to synchronize the physical hardware clock on our > intel interface from the external PTP master. Also we are using PHC2SYS > to synchronize system clock using the Physical hardware clock on intel > interface. However, we see that the phc2sys process shows an > explosion of offset and frequency values periodically. > > There is no additional/other NTP process running on this system. Below > are the way we are running PTP4L and PHC2SYS processes: > > ptp4l -i eno1 -m -s > phc2sys -s eno1 -O -37 -S 5 > > Attaching the logs for PTP4L and PHC2SYS process for a sample duration > where we observed explosion in PHC2SYS offset and frequency values. > > Any suggestions or pointers on what could be causing this? >
What device and driver are you using? $ ethtool -i eno1 Also what kernel version are you using? This sounds suspiciously like some bugs I've worked on in the past that involved issues with how the frequency adjustments were done. If you're using an e1000e-based device there are also several known bugs that have workarounds applied, but if your kernel is too old they might not contain these fixes. I would start here to make sure it's not something that has already been fixed first. > Regards, > Andy > _______________________________________________ Linuxptp-users mailing list Linuxptp-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linuxptp-users
