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Re: Minstrel rate-setting question

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Felix Fietkau wrote:
> I believe that it's not minstrel's fault. According to the information that
> I have about RTL8187L, the chip implements rate fallback. If the chip changes
> rates during retransmissions, the status information the way you gather it
> will not be accurate and will trick minstrel into believing that higher rates
> actually work (which in fact they don't). 
> Please do some transmissions at 54M and run a monitor mode capture on a different
> card to see if it changes the rate during transmission and how frequently it
> uses one rate before falling back (if indeed my theory is correct).
> This information could be used to provide some more accurate feedback through
> multi-rate retry status information.


I believe you have the clue. There is a register named RATE_FALLBACK
and a bit called RTL818X_RATE_FALLBACK_ENABLE. I'm testing a patch
that leaves this bit unset.

Thanks,

Larry
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