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Date:      Wed, 13 Oct 2004 00:35:41 -0700
From:      Luigi Rizzo <rizzo@icir.org>
To:        "Charles R. Hunter" <crh@physics.purdue.edu>
Cc:        freebsd-ipfw@freebsd.org
Subject:   Re: bursting traffic?
Message-ID:  <20041013003541.B28421@xorpc.icir.org>
In-Reply-To: <20041013041813.GH67624@curie.physics.purdue.edu>; from crh@physics.purdue.edu on Tue, Oct 12, 2004 at 11:18:13PM -0500
References:  <20041013041813.GH67624@curie.physics.purdue.edu>

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On Tue, Oct 12, 2004 at 11:18:13PM -0500, Charles R. Hunter wrote:
> 
> Hello!
> 
> I'm pretty new to ipfw with respect to using dummynet pipes and 
> queues for traffic shaping. For the life of me, I can't figure out
> how to do something I want:
> 
> How to force my interface to burst its traffic.

you cannot do that with dummynet. it is designed to
smooth traffic out of an interface, not burst it.

cheers
luigi

> That is, I want a pipe that  has a delay of A and
> a bandwidth of B but will stall itself at the *end* of 
> a count C of slots/bytes/whatever for a defined waiting period D
> and then continue.
> 
> Do I want a configurable queue delay maybe?
> 
> The ipfw/dummynet docs talk about the delay caused by a deep queue
> but doesn't mention a way to explicitly set a delay like you
> can for pipes.
> 
> Is there any way to accompish this with multiple pipes and queues
> perhaps?
> 
> Thanks,
> 
> Charles
> -- 
> Charles R. Hunter
> Director, Physics Computer Network
> Purdue University  crh XatX physics.purdue.edu
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