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From: Kevin Bowling <kevin.bowling@kev009.com>
Subject: Re: FreeBSD 10 network flapping, ix driver unreliable?
Date: Sat, 15 Feb 2014 19:32:39 -0700
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On 2/15/2014 4:43 PM, George Neville-Neil wrote:
>
> On Feb 15, 2014, at 15:14 , Kevin Bowling <kevin.bowling@kev009.com> wrote:
>
>> Hi,
>>
>> I have FreeBSD 10.0-RELEASE installed on two Dell C6100 nodes.  Each node has an Intel X520-DA2 dual port 10gig card.  One of the ports on each go to a switch using direct attach coaxial cables.  The other port is directly connected between the two nodes (think crossover in twisted pair terminology) again using direct attach coaxial cables.
>>
>> On both machines, and on both ports (including the "crossover"), the links flap several times per day.
>>
>> I've pasted the output of lspci -vv and dmesg here:
>> https://gist.github.com/kev009/9024442
>>
>> There's nothing outstanding about the setup otherwise.  I suspected some interaction with the switch initially but the "crossover" has eliminated that suspicion.
>>
>> It seems the ix driver is not very reliable under common conditions, i.e. https://forums.freebsd.org/viewtopic.php?f=7&t=44570 and a search of this list.  Any recommendations or tests?
>>
>
> Can you post (to your gist link) the output of sysctl dev.ix ?

Hi George,

sysctl info added to gist link.  ix0 has been up for around 27 days. 
ix1 for about 24hrs.

Regards,
Kevin Bowling