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

From: "KAVITA MATHUR" <kavitam@cdot.in>
To: Ben Greear <greearb@candelatech.com>,
	ath10k@lists.infradead.org, backports@vger.kernel.org
Cc: linux-wireless@vger.kernel.org
Subject: Re: fixed bit rate 9Mbps set as 24Mbps in g mode(legacy)
Date: Wed, 28 Feb 2018 09:33:16 +0530	[thread overview]
Message-ID: <20180228035700.M28643@cdot.in> (raw)
In-Reply-To: <3047f184-d600-7be7-52bc-2ed4cee37ffe@candelatech.com>

On Tue, 27 Feb 2018 08:41:50 -0800, Ben Greear wrote
> On 02/27/2018 12:49 AM, KAVITA MATHUR wrote:
> > Hi,
> >
> > 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_10.2.4.70.66
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.

> 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.

Thanks & Regards,
Kavita
> Thanks,
> Ben
> 
> >
> >
> > Thanks & Regards,
> > Kavita
> >
> >
> > --
> > To unsubscribe from this list: send the line "unsubscribe backports" in
> >
> 
> -- 
> Ben Greear <greearb@candelatech.com>
> Candela Technologies Inc  http://www.candelatech.com

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
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