From owner-freebsd-net Mon Feb 4 6:43:51 2002
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Date: Mon, 04 Feb 2002 15:43:10 +0100
From: Marko Zec <zec@tel.fer.hr>
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To: Julian Elischer <julian@elischer.org>, freebsd-net@freebsd.org
Subject: Re: ng_dummy - netgraph traffic shaping node
References: <Pine.BSF.4.21.0202011012400.67160-100000@InterJet.elischer.org>
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Julian Elischer wrote:
> hmm interesting...
>
> any docs?
> (we always include a man page when we commit a new node type.)
As the code is still work in progress, writing manpages doesn't make too much
sense before reaching a mature code state. Until then, I hope a basic howto
included on the web page will do the job.
> Any comments on netgraph in general
I'm still catching the impressions right now, though I must admit the first
banal thing I noticed I don't like is somewhat unconsistent hook naming
(left/right, upper/lower, downstream/upstream etc.).
Btw, where could I find some examples on parsing setsockopt() calls to
selected nodes, if such thing is possible at all?
Marko
> On Fri, 1 Feb 2002, Marko Zec wrote:
>
> > The result of an innocent netgraph programming exercise can be found at:
> >
> > http://www.tel.fer.hr/zec/BSD/ng_dummy/
> >
> > "ng_dummy" is a simple traffic shaper node that implements control of
> > traffic flow in both upstream and downstream direction. In each
> > direction, the traffic flows through the sequence of two FIFO-type
> > queues, which implement different queuing policies. The "inbound" queue
> > is rate limited, and emulates an interface output buffer. On "outbound"
> > queue, frames are dequeued based on preconfigured delay, thus emulating
> > propagation effects on a transmission link. Additional features include
> > random frame discarding based on BER; and emulation of phantom traffic,
> > which competes for available bandwidth, and thereby introduces inbound
> > queue congestions and delay jitter.
> >
> > Have fun!
> >
> > Marko
> >
> >
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