Hi,

I'm using a custom ARM board with an BCM43362 wifi chip from Broadcom.
The wifi chip is attached via SDIO to the controller with a clock of
48MHz. Linux kernel version is 4.7.

When measuring the network bandwidth with iperf3 I get a bandwith of
only around 5 Mbps. I found a similar thread at the Broadcom community
[1] where the test was done with a M4 CPU + BCM43362 and an average
result of 3.3 Mbps.

Interestingly, a BCM43362 Wi-Fi Dev Kit [2] notes a TCP data throughput
greater than 20 Mbps.

Why is the throughput I measured much lower? Note that I measured
several times with almost no neighbor devices or networks.

This is a test sample measured with iperf3:

    $ iperf3 -c 192.168.2.1 -i 1 -t 10
    Connecting to host 192.168.2.1, port 5201
    [  4] local 192.168.2.155 port 36442 connected to 192.168.2.1 port
    5201
    [ ID] Interval           Transfer     Bandwidth       Retr  Cwnd
    [  4]   0.00-1.00   sec   615 KBytes  5.04 Mbits/sec    0   56.6
    KBytes       
    [  4]   1.00-2.00   sec   622 KBytes  5.10 Mbits/sec    0   84.8
    KBytes       
    [  4]   2.00-3.00   sec   625 KBytes  5.12 Mbits/sec    0    113
    KBytes       
    [  4]   3.00-4.00   sec   571 KBytes  4.68 Mbits/sec    0    140
    KBytes       
    [  4]   4.00-5.00   sec   594 KBytes  4.87 Mbits/sec    0    167
    KBytes       
    [  4]   5.00-6.00   sec   628 KBytes  5.14 Mbits/sec    0    195
    KBytes       
    [  4]   6.00-7.00   sec   619 KBytes  5.07 Mbits/sec    0    202
    KBytes       
    [  4]   7.00-8.00   sec   608 KBytes  4.98 Mbits/sec    0    202
    KBytes       
    [  4]   8.00-9.00   sec   602 KBytes  4.93 Mbits/sec    0    202
    KBytes       
    [  4]   9.00-10.00  sec   537 KBytes  4.40 Mbits/sec    0    202
    KBytes       
    - - - - - - - - - - - - - - - - - - - - - - - - -
    [ ID] Interval           Transfer     Bandwidth       Retr
    [  4]   0.00-10.00  sec  5.88 MBytes  4.93
    Mbits/sec    0             sender
    [  4]   0.00-10.00  sec  5.68 MBytes  4.76
    Mbits/sec                  receiver

[1] https://community.broadcom.com/thread/3978
[2] http://www.mouser.de/new/broadcom/broadcom-bcm943362wcd4/

Best regards
Jörg Krause
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