adaptive rate algorithms and Atheros adaptive radio

I am a first time user of Atheros' chipset as well as madwifi.

 

I would like to know how the adaptive rate algorithms and the Atheros
adaptive radio options work when both are enabled.

 

My questions are:

 

1. It is my understanding that the adaptive rate algorithm ( sample,
minstrel, etc..) is enabled only when the rate is set to auto using the
iwconfig command. If an explicit rate such as 36M is set, then the
adaptive rate algorithm is disabled. Is my understanding correct?

 

2. Both adaptive rate algorithms as well as Atheros adaptive radio do
the same job of selecting the best possible data rate over air.

If both are enabled (rate set to auto using iwconfig and ar set to 1 /
enabled using the iwpriv) will there be a conflict of interests between
these?

It seems that the end result may be a rate that is not optimum or the
rates may not be stable. Please explain how we are supposed to use these
options

 

3. For sample rate algorithm 10% of available bandwidth (default
configuration) is used to send packets at various data rates & packet
sizes to determine the best data rate. What % of bandwidth does the
Atheros adaptive radio use to determine and set the parameters?

 

4. Is there documentation on how the adaptation is done by Atheros
adaptive radio?

 

 

Mohan

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