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Date:      Sun, 6 Oct 2002 15:26:25 +0200
From:      Christoph Moench-Tegeder <cmt@rz.uni-karlsruhe.de>
To:        freebsd-stable@FreeBSD.ORG
Subject:   Re: Traffic shaping
Message-ID:  <20021006132624.GA27191@rz-ewok.rz.uni-karlsruhe.de>
In-Reply-To: <006501c26d35$f6904720$1001a8c0@jennie>
References:  <200210050655.g956t3Mp091313@lurza.secnetix.de> <006501c26d35$f6904720$1001a8c0@jennie>

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## Maarten de Vries (mdv@unsavoury.net):

> I could do with some hints regarding traffic shaping. My homenetwork is
> hooked up to an assymetrical (1536/256) ADSL line, using a FreeBSD 4.6
> system which provides the usual NAT/Gateway/Firewall services. I'm using
> dummynet to control the amount of bandwidth used by certain hosts on the
> network, which all works fine. However, I still suffer from latency when the
> maximum up- and/or downstream of the line is being utilized. If I understand
> it well, this happens because the buffer in the ADSL modem fills up
> completely at those occasions. Is there anyway to prevent this from
> happening?

Limit the maximum usage of your line to about 90% to 95%. This prevents
usage of the queue in your modem. However, this will not work if
queueing on the remote side is the problem (bulk transfers like downloads
come to mind); you are out of luck if the queue on the remote side is too
long.

Regards,
cmt

-- 
Spare Space

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