[Make-wifi-fast] [bufferbloat-fcc-discuss] arstechnica confirms tp-link router lockdown

[Adrian Chadd]

You do that in hardware. Do the Mac, phy and RF in hardware.

This is what the qca hardware does.

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On Mar 13, 2016 5:25 PM, "David Lang" <david at lang.hm> wrote:

> On Sat, 12 Mar 2016, Adrian Chadd wrote:
>
> On 12 March 2016 at 11:14, Henning Rogge <hrogge at gmail.com> wrote:
>>
>>> On Sat, Mar 12, 2016 at 3:32 PM, Wayne Workman
>>> <wayne.workman2012 at gmail.com> wrote:
>>>
>>>> I understand that Broadcom was paid to develop the Pi, a totally free
>>>> board.
>>>>
>>>> And they already make wireless chipsets.
>>>>
>>>
>>> The question is how easy would it be to build a modern 802.11ac
>>> halfmac chip... the amount of work these chips do (especially with 3*3
>>> or 4*4 MIMO) is not trivial.
>>>
>>
>> It's not that scary - most of the latency sensitive things are:
>>
>> * channel change - eg background scans
>> * calibration related things - but most slow calibration could be done
>> via firmware commands, like the intel chips do!
>> * transmit a-mpdu / retransmit
>> * transmit rate control adaptation
>> * receiving / block-ack things - which is mostly done in hardware anyway
>> * likely some power save transition-y things too
>>
>
> you are ignoring MU-MIMO, the ability to transmit different signals from
> each antenna so that the interference patterns from the different signals
> result in different readable data depending on where the receiver is in
> relation to the access point is not a trivial thing.
>
> But it's one of the most valuable features in the spec.
>
> David Lang
>
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