From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andy Furniss <andy.furniss@dsl.pipex.com>
Date: Wed, 16 Nov 2005 16:49:48 +0000
Subject: Re: [LARTC] Using TBF to throttle a PC to 5kbps
Message-Id: <437B632C.8050803@dsl.pipex.com>
List-Id: <lartc.vger.kernel.org>
References: <200511141753.48133.lartc-337@ccp.com.au>
In-Reply-To: <200511141753.48133.lartc-337@ccp.com.au>
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To: lartc@vger.kernel.org

Lee Sanders wrote:
> Hi Everyone,
> 
> This is a simple question but I don't understand why the below tbf is not 
> working as expected by throttling traffic to 5kbps
> 
> If I throttle a PC's traffic using the below when traffic exceeds 5kbps 
> packets start getting dropped (as they should) but all traffic gets dropped. 
> not just the bit over 5kbps.
> 
> TC="tc add dev ppp0"
> $TC parent 8001:2 handle 2: tbf rate 5kbps latency 50ms burst 1540
> 
> I can see the "dropped" counter increasing, the overlimits counter stays the 
> same and there is a "backlog" counter with 21p

That's strange - this is a count of the packets queued, but why 21 - the 
settings you use make for a very small buffer 5kbps and 50ms is < 1 bulk 
packet.

do a tc -s -d qdisc ls dev ppp0 and you may see tbf has optimised it to 
even less.

Try with 500ms latency.

Andy.

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