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From: Francisco Reyes <lists@stringsutils.com>
To: Hongtao Yin <htyin@huawei.com>
Date: Fri, 16 Oct 2009 14:56:59 -0400
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Cc: =?ISO-8859-1?B?J0lzdHY/bic=?= <leccine@gmail.com>,
	freebsd-performance@freebsd.org
Subject: Re: Comparison of FreeBSD/Linux TCP Throughput performance
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Hongtao Yin writes:

> I ran newer FreeBSD code 8.0 RC1 this time. By using NetPIPE, we collected

Check
man tuning

There are a few parameters there worth exploring.
For example check the section on net.inet.tcp.sendspace and 
net.inet.tcp.recvspace