Fixing the Tx rate

[Yariv Bash]

On Sun, Nov 2, 2014 at 11:20 PM, Oleksij Rempel <linux at rempel-privat.de> wrote:
> 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
>

Perfect, I will investigate and write back for future generations :)
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