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Date:      Sat, 30 Apr 2011 13:43:39 -0700
From:      YongHyeon PYUN <pyunyh@gmail.com>
To:        Adrian Chadd <adrian@freebsd.org>
Cc:        freebsd-net@freebsd.org
Subject:   Re: collisions on tun interfaces ...
Message-ID:  <20110430204339.GA25769@michelle.cdnetworks.com>
In-Reply-To: <BANLkTinDhJOP3Xus1iW-mH8Ru2Q9hkofOw@mail.gmail.com>
References:  <201104290001.p3T01EvQ082443@artema.vpn.ibs> <20110429095231.GA17786@relay.ibs.dn.ua> <20110429182807.GA21084@michelle.cdnetworks.com> <20110429184634.GA34176@relay.ibs.dn.ua> <20110429185605.GB21084@michelle.cdnetworks.com> <BANLkTinDhJOP3Xus1iW-mH8Ru2Q9hkofOw@mail.gmail.com>

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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



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