Trouble shooting low rate MCS9 in 802.11ac

[Ben Greear]

On 07/25/2014 05:22 AM, Vu Hai NGUYEN wrote:
>>>> So probably the air condition you have forces the rate control to pick
>>>> MCS7 as the most suitable rates.
>
>>> What could I do to improve this? (Change the air conditioner LOL?)
>
>> Heh, he meant the RF environment in the location you are. :)
>> And ugh - this is why we need an open source ART already.
>
> My 2 devices have an ARM processor 1200MHz.
> If I connect these two devices by an Ethernet cable and doing iperf (in TCP)
> I can obtain 880 Mbps, it means that my processor can deal with that speed
> of data transfer. But if I use Wi-fi instead of Ethernet to test rate between these
> devices, my processor is exhausted, I run command top and see that 0~1%
> idle only,  ksoftirqd and kworker take most of my processor resource.
>
> Last week I discovered by chance that the module loaded in kernel can create
> effects to performance of rate, in my case it is "iptables". If I unload all module
> that related to iptables I can improve the performance.
> So I wonder if I can do some thing with the Wi-fi driver to  improve rate?
> Or the only solution is overclock/change my processor?

Can you run 'perf top' on your system when it is under load so we can
see where the CPU is being used the most?

Thanks,
Ben

>
> NGUYEN Vu Hai
> Acita-Sodielec
> Route de Mayres - B.P. 9
> 12100 St GEORGES DE LUZENCON
> FRANCE
>
>
>
>
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-- 
Ben Greear <greearb at candelatech.com>
Candela Technologies Inc  http://www.candelatech.com