Hi Jacob, Linux PTP members, We saw that we have an e1000e module installed on the systems where we are seeing phc2sys offset spikes.
*Output of lsmod | grep ptp* ptp 19231 7 igb,e1000e,mlx4_en,mlx5_core We tried to create the setup in our lab with the above kernel and OS version and also installed the e1000e module but we are not seeing spikes in this setup. Any other pointers or details around this issue? Thanks, Ankur On Thu, Jan 7, 2021 at 3:56 PM Ankur Sharma <ankur.at.n...@gmail.com> wrote: > Hi Jacob, > > Here are the additional details you requested: > > *ethtool -i eno1 OUTPUT:* > driver: igb > version: 5.6.0-k > firmware-version: 3.25, 0x800005cc > expansion-rom-version: > bus-info: 0000:06:00.0 > supports-statistics: yes > supports-test: yes > supports-eeprom-access: yes > supports-register-dump: yes > supports-priv-flags: yes > > KERNEL Details: > 3.10.0-1127.el7.x86_64 #1 SMP Tue Mar 31 23:36:51 UTC 2020 x86_64 x86_64 > x86_64 GNU/Linux > > *OS and Version:* > CentOS Linux release 7.8.2003 (Core) > > Regards, > Ankur > > On Thu, Jan 7, 2021 at 3:48 PM Jacob Keller <jacob.e.kel...@intel.com> > wrote: > >> >> >> 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 >> > > > -- > ankurandy > -- ankurandy
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