Banana Pi M2 (bpi-m2) Gigabit ethernet slow

[JSellares]

Hi,

 

I installed 'Armbian_5.00_Bananapim2_Ubuntu_trusty_4.4.1_desktop' image recently, because I had some problems with sinovoip images (strange hugh? ).

 

One of the problems was the gigabit ethernet slowness, but it seems with the armbian OS is still the same.

 

I get around 30Mbit/sec only on iperf tests. I have tested my network connections & router and I can get much more speed through other computers, but the banana shows this slow mark. The gigabit ethernet connection was one of the reasons tu buy the banana, but I don't know if I am doing something wrong, if I have a bad unit, etc... I have found some internet benchmarks but all of them are based on the original banana pi, which shows very good ethernet speeds.

 

Any help will be much appreciated,

 

Best Regards,

[tkaiser]

Please see Holsteiner's results here: http://forum.armbian.com/index.php/topic/126-fyi-armbian-running-on-a31s-based-banana-pi-m2/

 

Before I donated this crappy board to Hans de Goede I made also some tests with kernel 3.3.0 and IIRC I was able to exceed 600 Mbits/sec.

[Guest JSellares]

Hi,

Thank you for your answer.

So this bad performance does not make any sense... Maybe I have a defective unit? Any suggestion / parameter that I can check/change?

Regards,

[tkaiser]

Can you please have a look at the Ethernet PHY on the board? Is it RTL8211E or RTL8211CL? In case it's the latter there might be a workaround.

[JSellares]

Hi,

I have the RTL8211E :-/

By the way. Something weird happened. I have all the network connected using Cat 5e cables and Cat 6, but yesterday I found a shorter Cat 5 cable that I was not using and, just to test it, i used it to connect the banana. Guess what? Now iperf is showing 40Mbit/sec! I don't understany anything! xD. The cable used to connect the banana was a cross-over Cat 5e cable. I will go today and buy some Cat 6 cables to replace all the ones that I have and I will test everything again, because the results are quite weird.

 

Thank you for your time,

Best regards

[JSellares]

Hi!

Finally, as I suspected, it was the cable. I just bought a proper Cat 6 cable and guess what?! 973Mbits/sec. Awesome!!! It seems the old cable was defective...

Thank you for helping!

Best regards