netdev - Re: HTB vs CoDel performance

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Date:	Tue, 18 Sep 2012 12:15:53 +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 17:56 +0800, Lin Ming wrote:

> I need traffic priority/traffic shaping/rate control ... actually all
> QoS features on the router.
> And if I just set the rate to gigabit(no other settings), for example,
> 
> # 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
> 
> it should gain similar performance as pfifo_fast.
> 
> codel has no rate control. So seems I have to find way to optimize htb?

Are you really cpu limited ? You might hit some clocks artifacts.

rate limiting to 1Gbps probably need high resolution timers.

HTB is not the only way to rate limit.



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