Re: [Linuxptp-users] PTP Clock completely wrong on an Intel 82579L

[Keller, J. E <jac...@in...>]

> -----Original Message-----
> From: Norbert Lange [mailto:nol...@gm...]
> Sent: Thursday, February 23, 2017 2:20 AM
> To: Richard Cochran <ric...@gm...>
> Cc: Keller, Jacob E <jac...@in...>; linuxptp-
> us...@li...
> Subject: Re: [Linuxptp-users] PTP Clock completely wrong on an Intel 82579L
> 
> Yeah, I seen that matrix, and both NICs are on that list. Still have
> some rather serious issues, one is completely useless (82579LM, e1000e
> driver) and the other (i354, igb driver) apparently wraps the timer
> very 18 minutes, losing their master role.
> 
> Kind regards,
> Norbert
> 

The igb driver is likely bugged, it should be maintaining a separate "real counter" and the internal hardware counter wrapping should be hidden from the user.

Most likely in all these cases you have hardware the driver recognizes, and assumes a certain hardware frequency, but the software was not updated for the new frequency rate, so it is assuming a different internal rate which results in these problems.

Hopefully one of the e1000e maintainers will be able to give more insight on the intel-wired-lan list.

Thanks,
Jake