Re: [Linuxptp-users] Need help debugging failed clock synchronization

[Richard C. <ric...@gm...>]

On Tue, Mar 15, 2016 at 04:14:32PM -0700, John Hubbard wrote:
> Apologies if this has already been asked and answered.  I tried to look for
> solutions to my problem in the mailing list archive, but when I click the
> list archive link on the mailman page, I get a sourceforge page telling me
> Error 403 "Read access required".

Yes, SF is mostly broken.  Please use gmane for the archives.

   http://news.gmane.org/gmane.comp.linux.ptp.user

   http://news.gmane.org/gmane.comp.linux.ptp.devel
 
> I'm trying to configure a machine running CentOS 7 (3.10 kernel) with an
> Intel 82574L NIC to use PTP as its time source.

There are two Linux kernel driver workarounds for that unlucky card:

5e7ff97004  v3.16-rc1  e1000e: 82574/82583 TimeSync errata for SYSTIM read
37b12910dd  v4.3-rc1   e1000e: Fix tight loop implementation of systime read algorithm

You should try a newer kernel (4.3+) or use the Intel out of tree
drivers from SF.

Thanks,
Richard