netdev - Re: HTB vs CoDel performance

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Date:	Fri, 21 Sep 2012 15:23:33 +0800
From:	Lin Ming <mlin@...pku.edu.cn>
To:	Rick Jones <rick.jones2@...com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	networking <netdev@...r.kernel.org>
Subject: Re: HTB vs CoDel performance

On Thu, Sep 20, 2012 at 1:00 AM, Rick Jones <rick.jones2@...com> wrote:
> On 09/18/2012 06:26 PM, Lin Ming wrote:
>>
>> On Tue, Sep 18, 2012 at 6:15 PM, Eric Dumazet <eric.dumazet@...il.com>
>> wrote:
>>>
>>> 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
>
>
> At the risk of typing into Eric's keyboard, he was asking if you were
> saturating the CPU - was it getting to 100% utilization, that sort of thing.

Yes, ~98% utilization.

>
>
>>> rate limiting to 1Gbps probably need high resolution timers.
>>
>>
>> High resolution timer is enabled.
>
>
> When you are running your tests, what sort of CPU utilization do you see on
> the CPU of your router with HTB on vs off.  Some "quick and dirty" netperf

HTB off: ~85%
HTB on: ~98%

> tests on an Centrino-based laptop suggested that as an end system at least,
> HTB at 1 GbE (using your tc commands) increases service demand (what netperf
> calculates as CPU consumed per unit of work performed) ~15% for bulk
> transfer (netperf TCP_STREAM) and ~18% for small packet request/response
> (TCP_RR).
>
> rick jones
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