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Date:      Wed, 13 Jun 2007 02:22:49 +0200
From:      Mark Martinec <Mark.Martinec@ijs.si>
To:        freebsd-ipfw@freebsd.org
Subject:   Re: ipfw, pipes, queues, weights and managing an Internet connection
Message-ID:  <200706130222.49828.Mark.Martinec@ijs.si>
In-Reply-To: <937e203f0706121655s226351e2q2000288a454218fb@mail.gmail.com>
References:  <937e203f0706121655s226351e2q2000288a454218fb@mail.gmail.com>

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Lubomir,

> > pipe   2 config queue 4500bytes bw 3300Kbit/s
>
> This is something which I have searched for in the manpages before - what
> does the queue argument do when it's in the config line of the pipe
> instance? It says 4500bytes - any ideas?

It is the size of a queue for packets in dummynet.

It should not be too short so that a couple of packets fit in
to give traffic shaper some headroom for its decisions.

It should not be too long so that packets are not delayed
for too long. In my case 4500 bytes / 3300Kbit/s = 11 ms,
which is still good enough for VoIP and NTP.

  Mark



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