netdev - Re: HTB vs CoDel performance

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Date:	Tue, 18 Sep 2012 11:45:11 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Lin Ming <mlin@...pku.edu.cn>
Cc:	networking <netdev@...r.kernel.org>
Subject: Re: HTB vs CoDel performance

On Tue, 2012-09-18 at 17:28 +0800, Lin Ming wrote:
> Hi,
> 
> I'm testing htb performance on a gigabit router running 2.6.32 kernel.
> Packet path: PC1 ---> Router LAN port ---> Router WAN port ---> PC2
> 
> pfifo_fast: 920Mbps
> htb: 750Mbps, ~20% drops compared to pfifo_fast
> 
> htb tc commands as below,
> # tc qdisc add dev eth10 root handle 20: htb default 1
> # tc class add dev eth10 parent 20 classid 20:1 htb prio 2 rate
> 1024Mbit ceil 1024Mbit burst 1281408b cburst 1281408b
> 
> The performance drop seems caused by the complex htb enqueue/dequeue algorithm.
> 
> I had a quick look at CoDel code, seems it does not have so complex
> data structure as HTB.
> I'm going to backport CoDel. Is this a good choice?
> Can I gain similar performance as pfifo_fast?

codel is quite different than HTB : It has no rate control, so its very
fast. (But it has no prio differentiation as pfifo_fast with its 3
bands)

So what are your exact needs ?



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