Re: RPi 4b Wifi Device

[mlelstv%serpens.de@localhost (Michael van Elst)]

michael.cheponis%gmail.com@localhost (Michael Cheponis) writes:

>I use the built-in GigE adaptor on the RPi 4B, because it's convenient as I
>have wired ethernet most places.   So I can't help with WiFi.

Ethernet is also faster, even when the WiFi chip does 802.11ac.

For Wifi on a RPI4b:

With RPI-OS running iperf3 shows about 80Mbit/s.
NetBSD (-current, but -10 should be similar) gets me about 40MBit/s.

Wifi is connected to a SDHC controller, and handling I/O there generates
quite some overhead (while iperf3 is running):

  PID   LID USERNAME PRI STATE       TIME   WCPU    CPU NAME      COMMAND
    0   118 root     123 CPU/1       1:33 39.45% 39.45% sdmmc0    [system]
 7467 12269 mlelstv   85 mutex/2     0:03  4.79%  4.79% -         iperf3
    0     3 root     222 IDLE/0      0:04  2.59%  2.59% softnet*0 [system]
    0   101 root     222 IDLE/3      0:03  1.81%  1.81% softnet*3 [system]
    0    30 root     222 IDLE/2      0:02  1.32%  1.32% softnet*2 [system]
    0    24 root     222 IDLE/1      0:02  0.93%  0.93% softnet*1 [system]

That's about 80% of one core.