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Date: Wed, 18 Jan 2017 13:03:44 +0300
From: Slawa Olhovchenkov <slw@zxy.spb.ru>
To: "Eugene M. Zheganin" <emz@norma.perm.ru>
Cc: freebsd-net@FreeBSD.org, freebsd-stable <freebsd-stable@FreeBSD.org>
Subject: Re: decent 40G network adapters
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On Wed, Jan 18, 2017 at 02:48:19PM +0500, Eugene M. Zheganin wrote:

> Hi.
> 
> Could someone recommend a decent 40Gbit adapter that are proven to be
> working under FreeBSD ? The intended purpose - iSCSI traffic, not much
> pps, but rates definitely above 10G. I've tried Supermicro-manufactured
> Intel XL710 ones (two boards, different servers - same sad story:
> packets loss, server unresponsive, spikes), seems like they have a
> problem in a driver (or firmware), and though Intel support states this
> is because the Supermicro tampered with the adapter, I'm still
> suspicious about ixl(4). I've also seen in the ML a guy reported the
> exact same problem with ixl(4) as I have found.
> 
> So, what would you say ? Chelsio ?

I am use Chelsio and Solarflare.
Not sure about you workload -- I am have 40K+ TCP connections, you
workload need different tuning.
Do you planed to utilise both ports?
For this case you need PCIe 16x card. This is Chelsio T6 and
Solarflare 9200.