Is 802.11n rate control being worked on?

[Rui Paulo]

On 7 Sep 2010, at 19:41, John Nielsen wrote:

> I am working on a network scenario which would benefit greatly from the MIMO features and higher bandwidth of 802.11n. It's my understanding that 11n is not fully supported in FreeBSD since there is no appropriate rate control algorithm in the tree. Is that still the case?

I've worked on supporting 11n on ath_rate_sample but it's incomplete.

> 
> I would _really_ like to run FreeBSD for this project, and I believe the Atheros wireless cards I plan to use are supported by ath(4). I'd like to find out what else needs to happen to complete the picture. I may even go so far as to write some code myself. :)
> 
> Is anyone working on this at the moment?

Not really, I did some work in the past, but it's incomplete.

> 
> Is it just the rate control that needs to be done or are there other parts involved? Is MIMO separate?

We have MIMO on some non-Atheros drivers, but one of these drivers (Ralink 11n) is not yet in the tree.

> 
> Is there a detailed description of the missing pieces somewhere? Or a not-very-detailed summary of where to look and what to read to get started?

Not really. There's some interest from other FreeBSD committers to get this going, so I'll let them chime in.

Regards,
--
Rui Paulo