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To:     linux-wireless@vger.kernel.org
From:   Bjoern Franke <bjo@schafweide.org>
Subject: Realtek 8822BE: r8822be vs. rtwpci (mainline / lwfinger)
Message-ID: <50038b2f-8b90-d803-0377-2c19cc7ad78e@schafweide.org>
Date:   Fri, 6 Dec 2019 17:48:33 +0100
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Hi,

I'm a little confused about the status of the modules for the Realtek 
8822BE.

Once, there was r8822be which had some issues, but worked more or less 
reliable. Then came rtw88/rtwpci and in my Thinkpad A275 it is hardly 
usable. According to the router, a 390Mbit AC connection exists, but 
downloads drop to 70-100kb/s. The TX-Bitrate is stuck at 6.5Mbit and the 
rx drop misc counter increases nearly every second from time to time - 
while being at the same place all the time, 5m away from the router, a 
FritzBox 7590.

In contrast to the mainline module, lwfingers module does not have the 
TX-Bitrate-stuck issue and the connection drops are more rarely.

I switched to the 4.19 LTS kernel and r8822be gets a 866Mbit AC 
connection with 200-300Mbit througput, which is somehow impressive 
compared to the 50kbit-40Mbit of rtwpci. In addition, it shows that the 
issues seem not to be caused by interferences, as here are only 3 5Ghz 
wifis.

Can I do something to improve the situation regarding rtwpci?

Best Regards
Bjoern