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From: "Jörg Krause" <joerg.krause@embedded.rocks>
To: linux-wireless@vger.kernel.org
Cc: brcm80211-dev-list <brcm80211-dev-list@broadcom.com>,
	Brett Rudley <brudley@broadcom.com>,
	Arend van Spriel <arend@broadcom.com>,
	Franky Lin <frankyl@broadcom.com>,
	Hante Meuleman <meuleman@broadcom.com>
Subject: TCP data throughput for BCM43362
Date: Fri, 05 Aug 2016 22:46:20 +0200	[thread overview]
Message-ID: <1470429980.29489.10.camel@embedded.rocks> (raw)

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

             reply	other threads:[~2016-08-05 20:57 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-08-05 20:46 Jörg Krause [this message]
     [not found] ` <CAF7Mx6o+WuQqtzuApMWQ8YAkLSX7xQ_H06xmO--RxFdwHwzLdQ@mail.gmail.com>
2016-08-05 21:29   ` TCP data throughput for BCM43362 Jörg Krause
     [not found]     ` <CA+8PC_f7VQMwBfQmZZ_vUtYtNJKVYzmFmxziAwoG8-iRUeW9Jw@mail.gmail.com>
2016-08-06  8:07       ` Jörg Krause
2016-08-06 14:12       ` Jörg Krause
2016-08-07 11:41         ` Arend van Spriel
2016-08-12  9:25           ` Jörg Krause
2016-08-22 13:37           ` Jörg Krause
2016-08-24 18:35             ` Arend Van Spriel
2016-08-29 21:15               ` Jörg Krause
2016-09-14 13:41                 ` Jörg Krause
2016-09-14 18:13                   ` Arend Van Spriel
2016-09-19  6:36                     ` Jörg Krause
2016-09-21 14:15                       ` Arend van Spriel
2016-09-22  8:09                       ` Arend Van Spriel
2016-09-22 12:52                         ` Jörg Krause
     [not found]                           ` <CAF7Mx6q+B4RoURNF5XxewjF9aVGCXg==XU0aDD6w+354yXZ70Q@mail.gmail.com>
2016-10-11  6:14                             ` Jörg Krause
2016-10-12  8:11                               ` Arend Van Spriel
2016-10-12 14:27                                 ` Jörg Krause
2016-10-12 19:08                                   ` Arend van Spriel
2016-10-12 19:30                                     ` Jörg Krause
     [not found]                                       ` <CAF7Mx6rqfbhDL-MRZ93vzCdSskgqi_bVNn=1SGb_WKV=DZZ+YQ@mail.gmail.com>
2016-10-12 21:19                                         ` Jörg Krause
     [not found]                                           ` <CAF7Mx6pD5VZ57PHy5DSj8yLOLY4vir2JhEdEL8SB3kr91OqFsQ@mail.gmail.com>
2016-10-12 22:50                                             ` Jörg Krause
2016-10-12 20:48                                     ` Jörg Krause

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