From owner-freebsd-hackers@FreeBSD.ORG  Fri May 24 15:41:26 2013
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Date: Fri, 24 May 2013 16:41:25 +0100
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Subject: Low Tx-Rx performance with 10Gb NICs
From: Igor Mozolevsky <igor@hybrid-lab.co.uk>
To: Axel Fischer <afischer@marvell.com>
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Cc: Hackers freeBSD <freebsd-hackers@freebsd.org>,
 Markus Althoff <malthoff@marvell.com>, Lino Sanfilippo <lsanfil@marvell.com>,
 Igor Mozolevsky <igor@hybrid-lab.co.uk>, Ralf Assmann <rassmann@marvell.com>
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On Friday, 24 May 2013, Axel Fischer wrote:


Additionally I noticed the following TCP errors
> with netstat -s ...:
>
> 1186 data packets (1717328 bytes) retransmitted
> 6847875 window update packets
> 2319 duplicate acks
> 25831 out-of-order packets (37403288 bytes)
> 3733 discarded due to memory problems (drops)
> 1186 segment rexmits in SACK recovery episodes
> 1717328 byte rexmits in SACK recovery episodes
>
>
>

Looks like your data is flooding your memory buffers, have a look through
https://calomel.org/freebsd_network_tuning.html

-- 
Igor M.