On Wed, Mar 13, 2019 at 02:38:01PM +0100, Felix Fietkau wrote:
> On 2019-03-13 14:34, Stanislaw Gruszka wrote:
> > It's not clear for my why we should add 3dBm for 2x2 devices
> > and not for 1x1. 3dBm looks rater like minimal txpower and
> > hardware transmit at 3dBm + dev->txpower_cur / 2 .
> >
> > With the change reported txpower value are closer to regulatory
> > values, but honestly I have no idea what should be reported.
> >
> > Perhaps also some better comment should be added.
> >
> > Signed-off-by: Stanislaw Gruszka <[email protected]>
> The reason why we add 3dBm is because using two chains to transmit in
> the worst case (from regulatory point of view) doubles the transmit
> power (= +3dBm). There's no reason to do the same for 1x1.
Do we calculate and show correct txpower for mt76x0 then?
I have mt76x0u 50:3e:aa:a6:5d:32 and iwlmvm 1c:1b:b5:23:cf:58
devices on one laptop at the same location connected to AP.
RSSI values of both stations are quite similar:
Station 50:3e:aa:a6:5d:32 (on wlan0)
inactive time: 4971 ms
rx bytes: 11383
rx packets: 97
tx bytes: 2764
tx packets: 17
tx retries: 3
tx failed: 1
signal: -55 [-65, -55] dBm
signal avg: -57 [-65, -57] dBm
tx bitrate: 65.0 MBit/s MCS 6 short GI
rx bitrate: 6.0 MBit/s
authorized: yes
authenticated: yes
preamble: long
WMM/WME: yes
MFP: no
TDLS peer: no
Station 1c:1b:b5:23:cf:58 (on wlan0)
inactive time: 24261 ms
rx bytes: 11320
rx packets: 121
tx bytes: 2274
tx packets: 11
tx retries: 0
tx failed: 1
signal: -52 [-60, -52] dBm
signal avg: -54 [-59, -55] dBm
tx bitrate: 6.5 MBit/s MCS 0
rx bitrate: 6.0 MBit/s
authorized: yes
authenticated: yes
preamble: long
WMM/WME: yes
MFP: no
TDLS peer: no
On laptop txpower showed by iw for mt76x0u is 17 dBm , for iwlmvm
is 22 dBm (this is value from mac80211, iwlwifi does not implement
.get_txpower() callback).
I do not consider this as big issue though, but can confuse some users.
Apparently confuses me.
Stanislaw
