netdev - Re: HTB vs CoDel performance

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Date:	Wed, 19 Sep 2012 09:26:44 +0800
From:	Lin Ming <mlin@...pku.edu.cn>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	networking <netdev@...r.kernel.org>
Subject: Re: HTB vs CoDel performance

On Tue, Sep 18, 2012 at 6:15 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> 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.

Did you mean the cpu speed? It's an ARMv5 processor.
BogoMIPS	: 1196.03

>
> rate limiting to 1Gbps probably need high resolution timers.

High resolution timer is enabled.

>
> HTB is not the only way to rate limit.

I'll try other classful qdiscs.

Thanks.
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