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From: YongHyeon PYUN <pyunyh@gmail.com>
Date: Sat, 30 Apr 2011 13:43:39 -0700
To: Adrian Chadd <adrian@freebsd.org>
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Cc: freebsd-net@freebsd.org
Subject: Re: collisions on tun interfaces ...
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On Sat, Apr 30, 2011 at 11:35:22PM +0800, Adrian Chadd wrote:
> On 30 April 2011 02:56, YongHyeon PYUN <pyunyh@gmail.com> wrote:
> 
> > Sending lots of packets within short interval may overflow
> > interface's send queue. Try sending UDP packets with netperf and
> > see what counters are changed during the test with something like
> > "netstat -ndI tun0 -w 1".
> 
> The default sendq is 50. What about considering bumping that?
> 

It's tunable. Set net.link.ifqmaxlen.

> 
> Adrian