[rt2x00-users] [RFC/RFT 0/5] rt2x00: rt2800usb: rework tx path

[Andreas Hartmann]

Hello Helmut!

Helmut Schaa wrote:
> On Fri, Mar 9, 2012 at 3:06 PM, Andreas Hartmann
> <andihartmann at 01019freenet.de> wrote:
>> Ok, this means:
>>
>> - the ralink rate control algorithm is not part of the firmware /
>>  hardware and thus cannot be used (directly) by rt2x00.
> 
> Correct, we could only reimplement it in rt2x00.

To be honest, I'm a little bit surprised, that this functionality, which
is very important for the proper operation of a WLAN device, isn't part
of the firmware (at least optionally).

>> - rt2x00 probably uses minstrel
> 
> Correct, and minstrel_ht for 11n STAs.

This means, that an AP doesn't set rates on its own (= uses the rates of
the received frames)? Or does the AP use another rate control algorithm
for sending frames?

[very interesting information]

> However, if we can provide proper tx status feedback to minstrel_ht
> and improve minstrel some more for non-mrr hw (I've discussed
> possible approaches with Felix but haven't had time to work on it)
> I guess we can get a similar performance out of it.

I see - not that easy to handle the problems with the ralink usb devices
we face currently.


Thanks Helmut for teaching me (I really appreciate it),
Andreas