netdev - Re: mlx4_en SIOCSHWTSTAMP cycles the link

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Date:	Tue, 17 Dec 2013 07:06:38 -0500
From:	tedheadster <tedheadster@...il.com>
To:	Richard Cochran <richardcochran@...il.com>
Cc:	Shawn Bohrer <shawn.bohrer@...il.com>,
	Hadar Hen Zion <hadarh@...lanox.com>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Amir Vadai <amirv@...lanox.com>,
	netdev <netdev@...r.kernel.org>, tomk@...advisors.com,
	Shawn Bohrer <sbohrer@...advisors.com>
Subject: Re: mlx4_en SIOCSHWTSTAMP cycles the link

> After hacking around the SIOCSHWTSTAMP issue I've noticed that ptp4l
> synchronizes the PHC, however there must be another bug somewhere
> because it creates a 35 second offset from the PTP master.

There is an option to ptp4l to account for this. You would use "-O 35"
when starting ptp4, or perhaps '-O -35' (I forget exactly).

- Matthew
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