Re: [ath9k-devel] Disabling the third antenna for AR9380 in ath9k

From: Adrian Chadd
Date: Wed Jun 22 2011 - 09:46:15 EST

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Just find where in ath9k it sets the supported streams and set it to 2, not 3.

Adrian

On 22 June 2011 20:42, Fred Matthews <fredmm@xxxxxxxxxxxxx> wrote:
>
> Hi,
>
> I used that command to disable the third antenna, and applied it to both AP
> and STA AR9380 NICs.
> I then performed an IPerf test between both and then captured the statistics
> from the sender, (below) .
> You can see that in rc_stats (minstrel), the rate control actually
> "attempts" sending on 3 stream MCSs (16-23) around 256 times each.
>
> Is there any way to prevent the RC from even attempting those rates, as if I
> where to fully imitate an AR9280, it shouldnt attempt at those MCSs.
>
> Can Susinders comments also be detailed.
>
> Thanks in advance
>
> # cat /sys/kernel/debug/ieee80211/phy0/netdev\:wlan0/stations/00\MAC/
>
> AUTH
> ASSOC
> AUTHORIZED
> WME
> ht supported
> cap: 0x11ce
>    HT20/HT40
>    SM Power Save disabled
>    RX HT40 SGI
>    TX STBC
>    RX STBC 1-stream
>    Max AMSDU length: 7935 bytes
>    DSSS/CCK HT40
> ampdu factor/density: 3/6
> MCS mask: ff ff ff 00 00 00 00 00 00 00
> MCS tx params: 1
> 792
> 150 ffff ffff ffff ffff ffff 60 ffff ffff ffff ffff ffff ffff ffff ffff ffff
> a40
> -77
> 0
> type rate throughput ewma prob this prob this succ/attempt
> success attempts
> HT20/LGI MCS0 6.6 99.9 100.0 0( 0) 163
> 230
> HT20/LGI MCS1 13.1 100.0 100.0 0( 0) 75
> 75
> HT20/LGI MCS2 19.3 100.0 100.0 0( 0) 252
> 252
> HT20/LGI MCS3 25.4 100.0 100.0 0( 0) 75
> 75
> HT20/LGI MCS4 36.2 97.5 100.0 0( 0) 413
> 474
> HT20/LGI MCS5 0.0 0.0 0.0 0( 0) 0
> 76
> HT20/LGI MCS6 0.0 0.0 0.0 0( 0) 0
> 80
> HT20/LGI MCS7 0.0 0.0 0.0 0( 0) 0
> 256
> HT20/LGI MCS8 13.1 100.0 100.0 0( 0) 75
> 75
> HT20/LGI MCS9 25.4 100.0 100.0 0( 0) 70
> 70
> HT20/LGI MCS10 34.2 92.2 100.0 0( 0) 79
> 82
> HT20/LGI MCS11 0.0 0.0 0.0 0( 0) 0
> 76
> HT20/LGI MCS12 0.0 0.0 0.0 0( 0) 0
> 256
> HT20/LGI MCS13 0.0 0.0 0.0 0( 0) 0
> 256
> HT20/LGI MCS14 0.0 0.0 0.0 0( 0) 0
> 256
> HT20/LGI MCS15 0.0 0.0 0.0 0( 0) 0
> 256
> HT20/LGI MCS16 0.0 0.0 0.0 0( 0) 0
> 75
> HT20/LGI MCS17 0.0 0.0 0.0 0( 0) 0
> 68
> HT20/LGI MCS18 0.0 0.0 0.0 0( 0) 0
> 85
> HT20/LGI MCS19 0.0 0.0 0.0 0( 0) 0
> 257
> HT20/LGI MCS20 0.0 0.0 0.0 0( 0) 0
> 256
> HT20/LGI MCS21 0.0 0.0 0.0 0( 0) 0
> 256
> HT20/LGI MCS22 0.0 0.0 0.0 0( 0) 0
> 256
> HT20/LGI MCS23 0.0 0.0 0.0 0( 0) 0
> 256
> HT40/LGI MCS0 13.6 100.0 100.0 0( 0) 75
> 75
> HT40/LGI MCS1 26.5 100.0 100.0 0( 0) 72
> 72
> HT40/LGI MCS2 38.3 100.0 100.0 0( 0) 73
> 73
> HT40/LGI MCS3 49.7 99.9 100.0 0( 0) 70
> 73
> HT40/LGI MCS4 0.0 0.0 0.0 0( 0) 10
> 1220
> HT40/LGI MCS5 0.0 0.0 0.0 0( 0) 0
> 256
> HT40/LGI MCS6 0.0 0.0 0.0 0( 0) 0
> 256
> HT40/LGI MCS7 0.0 0.0 0.0 0( 0) 0
> 256
> HT40/LGI MCS8 26.2 98.9 100.0 0( 0) 73
> 74
> HT40/LGI MCS9 49.3 99.2 100.0 0( 0) 67
> 69
> HT40/LGI MCS10 20.5 28.9 0.0 0( 0) 14
> 255
> HT40/LGI MCS11 0.0 0.0 0.0 0( 0) 0
> 257
> HT40/LGI MCS12 0.0 0.0 0.0 0( 0) 0
> 256
> HT40/LGI MCS13 0.0 0.0 0.0 0( 0) 0
> 256
> HT40/LGI MCS14 0.0 0.0 0.0 0( 0) 0
> 256
> HT40/LGI MCS15 0.0 0.0 0.0 0( 0) 0
> 256
> HT40/LGI MCS16 0.0 0.0 0.0 0( 0) 0
> 74
> HT40/LGI MCS17 0.0 0.0 0.0 0( 0) 0
> 256
> HT40/LGI MCS18 0.0 0.0 0.0 0( 0) 0
> 255
> HT40/LGI MCS19 0.0 0.0 0.0 0( 0) 0
> 256
> HT40/LGI MCS20 0.0 0.0 0.0 0( 0) 0
> 256
> HT40/LGI MCS21 0.0 0.0 0.0 0( 0) 0
> 256
> HT40/LGI MCS22 0.0 0.0 0.0 0( 0) 0
> 256
> HT40/LGI MCS23 0.0 0.0 0.0 0( 0) 0
> 256
> HT40/SGI MCS0 15.1 100.0 100.0 0( 0) 70
> 70
> HT40/SGI MCS1 29.2 100.0 100.0 0( 0) 72
> 72
> HT40/SGI t MCS2 38.5 91.3 100.0 0( 0) 81
> 83
> HT40/SGI PMCS3 54.3 99.5 100.0 0( 0) 66536
> 67803
> HT40/SGI MCS4 0.0 0.0 0.0 0( 0) 0
> 256
> HT40/SGI MCS5 0.0 0.0 0.0 0( 0) 0
> 256
> HT40/SGI MCS6 0.0 0.0 0.0 0( 0) 0
> 256
> HT40/SGI MCS7 0.0 0.0 0.0 0( 0) 0
> 256
> HT40/SGI MCS8 29.2 100.0 100.0 0( 0) 67
> 67
> HT40/SGI T MCS9 54.6 99.9 100.0 0( 0) 310227
> 312339
> HT40/SGI MCS10 22.7 29.3 100.0 0( 0) 14
> 46.8 Mbits/sec 255
> HT40/SGI MCS11 0.0 0.0 0.0 0( 0) 0
> 256
> HT40/SGI MCS12 0.0 0.0 0.0 0( 0) 0
> 255
> HT40/SGI MCS13 0.0 0.0 0.0 0( 0) 0
> 256
> HT40/SGI MCS14 0.0 0.0 0.0 0( 0) 0
> 256
> HT40/SGI MCS15 0.0 0.0 0.0 0( 0) 0
> 256
> HT40/SGI MCS16 0.0 0.0 0.0 0( 0) 0
> 68
> HT40/SGI MCS17 0.0 0.0 0.0 0( 0) 0
> 256
> HT40/SGI MCS18 0.0 0.0 0.0 0( 0) 0
> 255
> HT40/SGI MCS19 0.0 0.0 0.0 0( 0) 0
> 256
> HT40/SGI MCS20 0.0 0.0 0.0 0( 0) 0
> 256
> HT40/SGI MCS21 0.0 0.0 0.0 0( 0) 0
> 256
> HT40/SGI MCS22 0.0 0.0 0.0 0( 0) 0
> 256
> HT40/SGI MCS23 0.0 0.0 0.0 0( 0) 0
> 256
>
> Total packet count:: ideal 365056 lookaround 13702
> Average A-MPDU length: 5.4
>
>> Date: Tue, 21 Jun 2011 14:25:36 +0530
>> Subject: Re: [ath9k-devel] Disabling the third antenna for AR9380 in ath9k
>> From: shafi.wireless@xxxxxxxxx
>> To: fredmm@xxxxxxxxxxxxx
>> CC: linux-kernel@xxxxxxxxxxxxxxx; linux-wireless@xxxxxxxxxxxxxxx;
>> ath9k-devel@xxxxxxxxxxxxxxxx; ath9k-devel@xxxxxxxxxxxxxxx;
>> susinder@xxxxxxxxxxxxxxxx
>>
>> On Tue, Jun 21, 2011 at 2:07 AM, Fred Matthews <fredmm@xxxxxxxxxxxxx>
>> wrote:
>> > Hi all,
>> > I am installing the AR9380 NIC on laptops, but some only have two UFL
>> > connectors, and thus I was wondering if using only two of the UFL
>> > antenna
>> > ports will have any negative effect or difference than installing a 2x2
>> > NIC
>> > (AR9280 for example which has only 2 ports anyway). Please kindly
>> > explain
>> > with references if possible.
>> > Also for example is there anyway to disable transmission on the third
>> > UFL
>> > port (antenna) from ath9k or otherwise.
>> > Thank you all very much
>>
>> you can change the tx/rx chainmask for 3x3 AR9380 to disable
>> transmission on the third antenna
>> cd /sys/kernel/debug/ieee80211/phy0/ath9k# echo 0x3 > tx_chainmask
>> cd /sys/kernel/debug/ieee80211/phy0/ath9k# echo 0x3 > rx_chainmask
>>
>> after this, ideally it should operate as 2x2 device as per Susinders
>> comments. but if you got AR9280 please try to use that if 2 antenna is
>> the constraint.
>>
>>
>> > _______________________________________________
>> > ath9k-devel mailing list
>> > ath9k-devel@xxxxxxxxxxxxxxx
>> > https://lists.ath9k.org/mailman/listinfo/ath9k-devel
>> >
>> >
>>
>>
>>
>> --
>> shafi
>
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> ath9k-devel@xxxxxxxxxxxxxxx
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>
>
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