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Re: [Discuss-gnuradio] TUN/TAP interface advantage

From: Josh Blum
Subject: Re: [Discuss-gnuradio] TUN/TAP interface advantage
Date: Sun, 16 Sep 2012 00:21:49 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:15.0) Gecko/20120827 Thunderbird/15.0

On 09/15/2012 11:45 PM, usrp n210 wrote:
> Is there any advantage to use TUN/TAP interface ?

Tun/tap is a convenient way to get access to the network stack from
userspace. Unfortunately the benchmark* apps abuse tun/tap as a mac
layer, which is precisely the wrong thing to do.

For example:

(if you wait a few days, there will be some sweet work released with MAC
layer + message passing in GRC. Stay tuned...)


> As 802.11bbn also uses TUN/TAP interface.
> But I think in the tun/tap performance degrades as we send the packet back
> to user process?
> Therefore I compare results with benchmark_xx.py in /ofdm  with tunnel.py
> in /ofdm.
> In results benchmark_xx.py do not give consistent throughput (i.e. it
> varies on channel) but tunnel.py gives 100% throughput irrespective of
> channel
> Will there be any valid reason for this ?
> If I want to implement 2-way communication in USRP should I use TUN/TAP
> interface?

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