From owner-freebsd-stable@freebsd.org  Tue Aug 18 14:18:51 2015
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Date: Tue, 18 Aug 2015 17:18:38 +0300
From: Slawa Olhovchenkov <slw@zxy.spb.ru>
To: Daniel Braniss <danny@cs.huji.ac.il>
Cc: Hans Petter Selasky <hps@selasky.org>, Rick Macklem <rmacklem@uoguelph.ca>,
 FreeBSD Net <freebsd-net@freebsd.org>,
 FreeBSD stable <freebsd-stable@freebsd.org>,
 Christopher Forgeron <csforgeron@gmail.com>
Subject: Re: ix(intel) vs mlxen(mellanox) 10Gb performance
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On Tue, Aug 18, 2015 at 05:09:41PM +0300, Daniel Braniss wrote:

> sorry, it's been a tough day, we had a major meltdown, caused by a faulty gbic :-(
> anyways, could you tell me what to do?
> comment out, fix the off by one?
> 
> the machine is not yet production.

Can you collect this information?
https://lists.freebsd.org/pipermail/freebsd-stable/2015-August/083113.html

And 'show interface' (or equivalent: error/collsion/events counters)
from both ports from HP8200.