Re: fixed bit rate 9Mbps set as 24Mbps in g mode(legacy)

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On 02/27/2018 08:03 PM, KAVITA MATHUR wrote:

On Tue, 27 Feb 2018 08:41:50 -0800, Ben Greear wrote
On 02/27/2018 12:49 AM, KAVITA MATHUR wrote:

I have configured AP in g mode and tested legacy rates.All basic rates and supported
rates(1,2,5.5,11,6,9,12,18,24,36,48,54) are set except 9Mbps.

When fixed bit rate 9Mbps is set, it gets set as 24 Mbps. This issue has been observed
in backports-4.4.2-1 as well as latest git version of ath10k driver.

Is anybody aware of this issue? How can I fix this rate 9Mbps?

You should specify which firmware/chipset you are using, since this might
easily be a firmware issue.

Chipset : QCA988x
ath10k version : git 16 oct 2017(v4.14-rc2-1-24-gc6db471)
firmware version : firmware-5.bin_10.
Kernel version : 3.12

And, how are you determining that 'it gets set to 24Mbps'.  Is that the
encoding you see in a wifi sniff, or is the driver being set to 24Mbps
improperly when you use iw (or whatever) to try configuring the rate?

I have used command "iw wlan0 station dump" to see set data rate as well as I have
sniffer. Measured data throughput is also as per 24Mbps.

I use more recent (and hacked) kernels/drivers, and my own wave-1 firmware.  I did have
a bug in some code I wrote because the 48Mbps rate code is '0x0', and some of
my code was ignoring it thinking it was not properly set.  I did see correct
on-air 48Mbps encoding rates though.

Possibly you have similar problems with rate-code 0x0.

Have you tried doing a capture with an ath9k or some other non-ath10k driver
to see if it is really 24Mbps on air?

Recent upstream mac80211 has broken the ability to set a single tx rate as
well, last I checked.

Other rates are set properly except 9Mbps.By default it sets as 6Mbps, when data
transfer starts, then it set to the mentioned fixed data rate.

Setting the tx rate through normal API will not effect management frames, and at the beginning of
the connection, perhaps no data frames have been sent/received yet, so you would
see 6Mbps reported.


Thanks & Regards,

Thanks & Regards,

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Ben Greear <greearb@xxxxxxxxxxxxxxx>
Candela Technologies Inc

Thanks & Regards,
कविता माथुर Kavita Mathur
वरिष्ठ अनुसंधान अभियंता  Senior Research Engineer
सी-डॉट                      C-DOT
इलैक्ट्रॉनिक्स सिटी फेज़ I         Electronics City Phase I
होसूर रोड, बेंगलूरु               Hosur Road, Bengaluru – 560100
फोन  Ph 080-28529896
This email and any files transmitted with it

Ben Greear <greearb@xxxxxxxxxxxxxxx>
Candela Technologies Inc

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