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aircrack-ng / rtl8812au

RTL8812AU/21AU and RTL8814AU driver with monitor mode and frame injection
GNU General Public License v2.0
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v5.2.20 - Problem with 80 Mhz bandwidth #253

Closed francoism90 closed 5 years ago

francoism90 commented 5 years ago

Thanks for updating this module, I did some testing. :)

This is being reported on the v5.2.20 driver:

$ iwconfig                                                                                      
wlp0s20f0u4  IEEE 802.11  ESSID:".."  
          Mode:Managed  Frequency:5.24 GHz  Access Point: ..   
          Bit Rate=450 Mb/s   Tx-Power=30 dBm   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality=67/70  Signal level=-43 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0

lo        no wireless extensions.

The v5.3.4 branch shows the full 1300 Mb/s bitrate on my ASUS USB-AC68.

This seem to differ:

TX STBC => only showing on v5.2.20 - think this is a good thing?
RX STBC 1-stream => RX STBC 3-streams on v5.3.4
HT Max RX data rate: 404 Mbps => HT Max RX data rate: 450 Mbps on v5.3.4
SU Beamformer => only showing on v5.2.20 - think this is a good thing?

Maybe this is an issue with the STBC streams? Shouldn't they show 3, as this device should have more then one?

Thanks again for your hard work!

aircrack-ng commented 5 years ago

Are you sure the speed is really that much? What I mean is that what iwconfig reports is just information, it may not always be accurate (look at txpower, there is no way it's 30dbm). Do an iperf to confirm the speed.

francoism90 commented 5 years ago

@aircrack-ng iperfs results:

------------------------------------------------------------
Client connecting to server, TCP port 5001
TCP window size: 85.0 KByte (default)
------------------------------------------------------------
[  3] local <ip> port 34118 connected with <ip> port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.1 sec  99.4 MBytes  82.4 Mbits/sec
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[  4] local <ip> port 5001 connected with <ip> port 34118
[ ID] Interval       Transfer     Bandwidth
[  4]  0.0-10.5 sec  99.4 MBytes  79.5 Mbits/sec

Latest router log:

Device | IP Address | Rx/Tx & RSSI | Connected | Flags
-- | -- | -- | -- | --
Chromecast | 176 / 293 Mbps | -65 dBm | 18:05:37 | AU
Galaxy-S9 | 780 / 650 Mbps | -57 dBm | 5:59:25 | AU
Desktop (rtl8812) | 270 / 81 Mbps | -46 dBm | 2:25:01

As you can see the desktop speed dropped a lot when using branch v5.2.20, using v5.3.4 it will perform like the Galaxy S9 is doing.

francoism90 commented 5 years ago

@kimocoder @ValZapod I don't have this device anymore. Will leave it open.

kimocoder commented 5 years ago

I've started looking just now :+1:

kimocoder commented 5 years ago

  1. You may try fiddling with this setting (just remember "modprobe -r 88XXau && modprobe 88XXau" after build/install)

  2. The spatial streams is hardcoded in the driver, and on the 8814 HAL it was only using 1 stream, fariouche made all 4 streams working in the 8814.

francoism90 commented 5 years ago

@ValZapod I suggest to clone this repo, revert these commits and see if it makes a differences.

I'm also closing this issue since I don't have the device anymore.