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Date: Mon, 5 Oct 2009 17:01:02 +0800
From: Eugene Grosbein <eugen@kuzbass.ru>
To: rihad <rihad@mail.ru>
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Cc: freebsd-net@freebsd.org, Luigi Rizzo <rizzo@iet.unipi.it>
Subject: Re: dummynet dropping too many packets
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On Mon, Oct 05, 2009 at 01:53:20PM +0500, rihad wrote:

> As you can see the drops gradually went away completely at about 4:00 
> a.m., and started coming up at about 10:30 a.m., although at a lower 
> rate, probably thanks to me bumping "ipfw ... queue NNN" up to 5000 at 
> 10a.m. this morning. The traffic flow between 4a.m. and 10:30a.m., the 
> "quiet" times, is about 200-330 mbit/s 5 minute average, without a 
> single drop. But after that, in come the drops, no matter how high I set 
> the queue. Should I try 10000 slots? 20000?

First switch from taildrop (default) to GRED, it is designed to fight
your problem.

Eugene Grosbein