Fixing the Tx rate

[Oleksij Rempel]

Am 02.11.2014 um 16:17 schrieb Yariv Bash:
> Hi guys,
> 
> I'm trying to fix (as in fixate or choose only one) the Tx rate of a TP
> LINK TL-WN722N device, containing the Atheros AR9271 chip.
> Specifically I want it fixed on a low rate - I want to play with the
> 1,2,5.5 and 6 MBPS rates.
> Yes, 6 belongs to 802.11g, I know :)
> 
> I've tried variations of the:
> sudo iw dev wlan0 set bitrates legacy-2.4 6
> Command, while the device is down, up, configured and what not, and
> unfortunately, this does not work too well - The device still falls to
> 1MBit when the connection becomes unstable, and almost never returns to a
> higher rate (or takes a lot of time)
> 
> I'm working with a raspberry pi, already compiled the ath9k_htc driver (FW
> Version 1.4), and I already have 2 raspberry pi's talking directly - one as
> the host of course (hostapd 2.3) each with its own WN722N device.
> Oh, and I'm working with the Minstrel rate algorithm, but could of course
> change to PID if it helps.
> 
> One thing I thought about was that 1MBit is a default fallback with
> minstrel, so it might be hardwired. But again, even when the link shows
> really good reception (-40-50dBm), the link stays at 1MBPS after it falls
> there on a bad connection.
> 
> I'm considering tweaking the firmware code to just one rate, not sure if
> this is the best option, but would love any directions as to where in the
> code that can be done, or what am I doing wrong...

I think this question should go in to FAQ :)
There firmware has own, may be buggy, internal rate controller. Linux
driver ath9k_htc can only suggest the driver to use some rate.
Any one who cares is free and _welcome_ to investigate it :) And provide
patches.

-- 
Regards,
Oleksij

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