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Date: Mon, 5 Oct 2009 20:00:57 +0800
From: Eugene Grosbein <eugen@kuzbass.ru>
To: rihad <rihad@mail.ru>
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Cc: freebsd-net@freebsd.org
Subject: Re: dummynet dropping too many packets
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On Mon, Oct 05, 2009 at 04:50:10PM +0500, rihad wrote:

> >>Where has TCP slow-start gone? My router box 
> >>isn't some application proxy that starts downloading at full 100 mbit/s 
> >>thus quickly filling client's 1 mbit/s link. It's just a router.
> >
> >While there is no or little competition for bandwidth from the router
> >to clients, TCP would work just fine. I suspect your shaping policy
> >makes heavy competition between clients. In this case, TCP behaves
> >not-so-well without help of router's good shaping algorythms
> >and taildrop is not good one.
> >
> 
> Nothing fancy (i.e. no competition). Only tons of per-user pipes 
> simulating the given throughput.

You've mentioned previously: "The pipes are fine, each normally having
100-120 concurrent consumers (i.e. active users)."
This IS competition between TCP flows inside each pipe.

Eugene Grosbein