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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