[CWN-Summit] Students tout WiFi co-ops as alternative to municipal WiFi

Aaron Kaplan aaron at lo-res.org
Sun Feb 10 16:01:48 CST 2008


On Feb 10, 2008, at 10:49 PM, David Young wrote:

> On Sun, Feb 10, 2008 at 10:07:22AM +0100, Aaron Kaplan wrote:
>>
>>>
>>>> *) These atheros chips offloads the radio computation to the CPU.
>>>> Many packets? -> lots of CPU load -> packetloss
>>>
>>> I can tell you quite confidently that that is not true.  Silicon in
>>> the
>>> Atheros chip does the radio computation.
>>>
>>>
>>
>> different atheros chips do it in HW. This one offloads the
>> computation to the CPU (given that they are the same design as FON).
>
> By "radio computation," I take that you mean the modulation/ 
> demodulation,
> and that is definitely not happening on the host CPU.  Perhaps you  
> mean
> a different computation than I think.
>

I mean layer all 2 things. From layer 3 perspective this is already  
"radio" for me ;-)


> The Atheros design does not inherently demand that the host CPU work
> very hard.
>
send many packets thru one of those chips and observer the BW drop







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