Re: Slow connection with rtl8xxxu and 8192eu chipset

[Jes Sorensen <jes.sorensen@gmail.com>]

On 11/14/2017 05:39 AM, Nikolay Borisov wrote:
> 
> 
> On 14.11.2017 11:26, Nikolay Borisov wrote:
>> (Please CC as I'm not subscribed)
>>
>> Hello,
>>
>> I have the tp-link tl-wn822N usb wifi dongle. lsbusb reports it as
>>
>> Bus 001 Device 003: ID 2357:0108
>>
>> Unfortunately with the in-kernel rtl8xxxu driver I don't get very good
>> results:
>>
>> wifi1     IEEE 802.11  ESSID:"HOME"
>>           Mode:Managed  Frequency:2.462 GHz  Access Point:
>> 30:B5:C2:75:A4:CD
>>           Bit Rate=1 Mb/s   Tx-Power=20 dBm
>>           Retry short limit:7   RTS thr=2347 B   Fragment thr:off
>>           Power Management:off
>>           Link Quality=26/70  Signal level=-84 dBm
>>           Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
>>           Tx excessive retries:0  Invalid misc:165   Missed beacon:0
>>
>>
>> At the same time if I use an out of tree driver acquired from github:
>> https://github.com/Mange/rtl8192eu-linux-driver I get the following:
>>
>> wifi1     IEEE 802.11bgn  ESSID:"HOME"  Nickname:"<WIFI@REALTEK>"
>>           Mode:Managed  Frequency:2.462 GHz  Access Point:
>> 30:B5:C2:75:A4:CD
>>           Bit Rate:144.4 Mb/s   Sensitivity:0/0
>>           Retry:off   RTS thr:off   Fragment thr:off
>>           Power Management:off
>>           Link Quality=81/100  Signal level=100/100  Noise level=0/100
>>           Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
>>           Tx excessive retries:0  Invalid misc:0   Missed beacon:0
>>
>> Clearly this is a software problem of the in-kernel driver. I'm using
>> v4.10.17 with commit c14239f23adb ("rtl8xxxu: Add another 8192eu device
>> to the USB list") so that my device is recognised. Latest commit for
>> that driver in my kernel is: c59f13bbead4 ("rtl8xxxu: Work around issue
>> with 8192eu and 8723bu devices not reconnecting").
>>
>> Any ideas what I can do to further debug this, I'd really like to use
>> the in-kernel driver ?
> 
> I just tested with verbatim 4.14 and even though the wireless works, 
> iwconfig reports something strange: 
> 
> iwconfig wifi1
> wifi1     no wireless extensions.
> 
> However, my device works as expected (albeit still slow): 
> 
> wifi1     Link encap:Ethernet  HWaddr 18:d6:c7:0d:47:3c  
>           inet addr:10.20.1.175  Bcast:10.20.1.255  Mask:255.255.255.0
>           inet6 addr: fe80::281d:5f27:eb1b:8ded/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:38903 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:24689 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000 
>           RX bytes:51524413 (51.5 MB)  TX bytes:5503039 (5.5 MB)

iwconfig has been deprecated for a decade, but maybe you could elaborate
on what you feel is strange in this output?

The 8192eu driver has some issues, it looks like firmware rate support
isn't working and it therefore transmits everything at low rates. I have
to find some time to look into this.

Jes