=?utf-8?Q?=E5=9B=9E=E5=A4=8D=EF=BC=9A_?=WiFi TDMA AR7161, results and moving forward

[adam.huang]

hi, can you share your complex  FW?

thanks.  


在 2013年2月27日星期三，下午4:51，Mukunda Haveri 写道：

> Hi,
>  
> I have been trying in vain to get 2 freebsd based systems working with a
> wlan-lan bridge.
>  
> | Host A | <---> | Lan-side arge0 | <--> | AP Wlan | <--- Air ------- >
> | STA Wlan | <---> | Lan-side arge0 | <--> | Host B |
>  
> Is this functionality broken on the head? OR Am I missing something?
> Appreciate if somebody can help me with scripts to setup the traffic in the
> mode mentioned above.
> We are using AR9280 based wireless card along with AR7161 boards from
> Compex...
>  
> Thanks,
> Mukunda
>  
>  
> On Tue, Feb 19, 2013 at 2:58 AM, Adrian Chadd <adrian at freebsd.org (mailto:adrian at freebsd.org)> wrote:
>  
> > On 18 February 2013 03:31, Mukunda Haveri <mukunda at pointred.co (mailto:mukunda at pointred.co)> wrote:
> > >  
> > > Thanks to Adrian's WiFi scripts, we were able to get the TDMA working on
> > the
> > > Compex-AR7161 board. The results were surprising; we are able to do,
> >  
> > close
> > > to 100 mbps one way iperf tests and 40 mbps bidirectional Iperf in
> >  
> > non-TDMA
> > > mode. We were able to achieve this, only after disabling all the debug
> > > options in the kernel. Porting the U-Boot to the Compex-boards did take
> > >  
> >  
> > lot
> > > of effort, but not the "FreeBsd". Many thanks to all the "scientists" who
> > > made this possible.
> > >  
> >  
> >  
> > Nice! Which wireless cards are you using?
> >  
> > [ AR9280 ]
>  
>  
> > > Moving forward, it is observed that the TDMA throughput peaks at 9 mbps
> > and
> > > refuses to move beyond. After reducing the slot duration to 1 ms, the
> > > throughput increased to around 12 mbps. I was expecting the TDMA to
> > >  
> >  
> > yield a
> > > better throughput because of collision-less scheme. I would like to
> > > understand if our observation is expected or if there's some inherent
> > > limitation within the TDMA controller.
> > >  
> > > It will be good to have some feedback from TDMers with similar
> > experience or
> > > better.
> >  
> >  
> > Right now the TDMA code doesn't implement MCS rates or TX aggregation.
> > Thus you're not going to get 11n like throughput.
> >  
> > The first thing to implement is allowing for MCS rates
> > (non-aggregation) and make sure all the packet duration calculations
> > are being done "right".
> >  
> > After that, we need to implement delayed blockack support in net80211
> > and the ath driver. That requires the stack to support handling BA
> > requests/responses and ath(4) to mark all frame descriptors in a
> > delayed-BA TID to be no-ack.
> >  
> > Once that's done, we can tie it all together to make it work over TDMA. :-)
> >  
> > Thanks,
> >  
> >  
> > Adrian
>  
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