Fixing the Tx rate

[Oleksij Rempel]

Am 02.11.2014 um 21:10 schrieb Yariv Bash:
> On Sun, Nov 2, 2014 at 11:02 PM, Oleksij Rempel <linux at rempel-privat.de> wrote:
>> 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
>>
> 
> Thanks for the tip !
> If I'm compiling the ar9271.fw file using
> https://github.com/qca/open-ath9k-htc-firmware, don't I have access to
> the code of the internal rate controller ?
> Or is this file (and source code) just another layer to a closed
> binary I cannot explore ?
> Thanks.

You have full access to everything in this firmware. It is completely
open source.

-- 
Regards,
Oleksij

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