ARM9 USB WiFi Results¶

The following tests were performed using a Linux PC running the "nttcp" application in daemon mode and having a MityDSP-L138 based device connect using its own nttcp application to the test server. The connection between the Wireless access point and the server was gigabit.

NTTCP Setup¶

For the server side we were able to use the servers package manager to setup and install NTTCP.

For the MityDSP-L138 we cross-compiled the application to work on our ARM9 CPU. It is attached to this wiki page. The application needs to be copied onto your target L138 SoM. Example test cases of using the nttcp application are shown in the sections below, see -help for details about the options used.

Testing¶

TP-Link TL-WN722N¶

MityDSP-L138F on USB 2.0 Port with 3.2.0 Kernel
Atheros9K Chipset
Max TX = 10.9 MBit
Max RX = 7.7 MBit

wlan0     IEEE 802.11bgn  ESSID:"ourssid" 
          Mode:Managed  Frequency:2.437 GHz  Access Point: 00:24:B2:56:CD:3C
          Bit Rate=54 Mb/s   Tx-Power=20 dBm
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Encryption key:off
          Power Management:off
          Link Quality=56/70  Signal level=-54 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:1592   Missed beacon:0

root@mityomapl138:~# ./nttcp -t -T userv4
     Bytes  Real s   CPU s Real-MBit/s  CPU-MBit/s   Calls  Real-C/s   CPU-C/s
l  8388608    6.27    3.12     10.7067     21.5093    2048    326.74     656.4
1  8388608    6.28    0.06     10.6864   1118.4251    5873    935.21   97878.4
root@mityomapl138:~# ./nttcp -r -T userv4
     Bytes  Real s   CPU s Real-MBit/s  CPU-MBit/s   Calls  Real-C/s   CPU-C/s
l  8388608    8.84    2.82      7.5946     23.7975    3257    368.59    1155.0
1  8388608    8.73    0.00      7.6876  16777.2160    2048    234.61  512000.0

TP-Link TL-WN727N¶

MityDSP-L138F on USB 2.0 Port with 3.2.0 Kernel
RALink 2870 Chipset
Max TX = 9.4 MBit
Max RX = 5.5 MBit

wlan0     IEEE 802.11bgn  ESSID:"ourssid" 
          Mode:Managed  Frequency:2.437 GHz  Access Point: 00:24:B2:56:CD:3C
          Bit Rate=54 Mb/s   Tx-Power=20 dBm
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Encryption key:off
          Power Management:on
          Link Quality=43/70  Signal level=-67 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:9  Invalid misc:157   Missed beacon:0

eth0      no wireless extensions.

root@mityomapl138:~# ./nttcp -t -T userv4
     Bytes  Real s   CPU s Real-MBit/s  CPU-MBit/s   Calls  Real-C/s   CPU-C/s
l  8388608    7.13    1.40      9.4151     47.9349    2048    287.33    1462.9
1  8388608    7.14    0.06      9.4052   1118.4251    5798    812.58   96628.5
root@mityomapl138:~# ./nttcp -r -T userv4
     Bytes  Real s   CPU s Real-MBit/s  CPU-MBit/s   Calls  Real-C/s   CPU-C/s
l  8388608   12.28    1.90      5.4645     35.3205    5393    439.14    2838.4
1  8388608   12.22    0.01      5.4913   8388.6080    2048    167.58  256000.0

Embedded Works EW7220UB¶

MityDSP-L138F on USB 2.0 Port with 3.2.0 Kernel
Atheros9K Chipset
Max TX = 9.5 MBit
Max RX = 7.0 MBit

wlan0     IEEE 802.11bgn  ESSID:"ourssid" 
          Mode:Managed  Frequency:2.437 GHz  Access Point: 00:24:B2:56:CD:3C
          Bit Rate=54 Mb/s   Tx-Power=20 dBm
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Encryption key:off
          Power Management:off
          Link Quality=68/70  Signal level=-42 dBm
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:3   Missed beacon:0

root@mityomapl138:~# ./nttcp -t -T 10.0.0.114
     Bytes  Real s   CPU s Real-MBit/s  CPU-MBit/s   Calls  Real-C/s   CPU-C/s
l  8388608    7.02    3.86      9.5638     17.3857    2048    291.86     530.6
1  8388608    7.04    0.06      9.5349   1118.4251    5951    845.52   99178.4
root@mityomapl138:~# ./nttcp -r -T 10.0.0.114
     Bytes  Real s   CPU s Real-MBit/s  CPU-MBit/s   Calls  Real-C/s   CPU-C/s
l  8388608    9.64    3.30      6.9645     20.3360    3162    328.15     958.2
1  8388608    9.46    0.00      7.0944  16777.2160    2048    216.51  512000.0

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