2015-09-21, 00:48
disappointing, seems like the built in 100Mbit or a USB Gbit adapter (up to the max USB2 bus speed) is the way to go where possible.
I have mine using the built-in ethernet, glad to know that the only thing I'd be missing by going to 802.11ac is a wire and $30.
Thank you for doing the tests and posting the results.
Here are my tests for ethernet and Gbit USB adapter for those who may be wondering about that route. I used your same IPERF2 settings, (60 sec, TCP window size: 43.8 KByte (default))
This is from a RPI2 to a local Core I5 Win8.1 file server. Results were consistent across 3 runs
RPi2 - Openelec - Millhouse Jarvis build #0919
Built in Ethernet: 674 MBytes 94.2 Mbits/sec
Plugable USB3-E1000: 1.31 GBytes 187 Mbits/sec
PC with same USB3 adapter in a USB3 port to file server for reference
Plugable USB3-E1000: 7.86 GBytes 884 Mbits/sec
(Edit) To quell my own curiosity, the same adapter plugged into the USB2 port of the same PC
Plugable USB3-E1000: 1.57 GBytes 225 Mbits/sec
Overclocking the RPi2 sdram made no difference, so it appears to be a bus speed limit not a memory speed limit.
After the reboot, speeds increased from 187 to 192 Mbits/sec over consecutive runs with sdram at both 450 and 500mhz.
I'd have expected the 802.11ac tests to be close to the RPi2 USB limit I appear to be hitting, at 187 Mbits/sec, even with a single antenna (433 Mbit/s.)
I have mine using the built-in ethernet, glad to know that the only thing I'd be missing by going to 802.11ac is a wire and $30.
Thank you for doing the tests and posting the results.
Here are my tests for ethernet and Gbit USB adapter for those who may be wondering about that route. I used your same IPERF2 settings, (60 sec, TCP window size: 43.8 KByte (default))
This is from a RPI2 to a local Core I5 Win8.1 file server. Results were consistent across 3 runs
RPi2 - Openelec - Millhouse Jarvis build #0919
Built in Ethernet: 674 MBytes 94.2 Mbits/sec
Plugable USB3-E1000: 1.31 GBytes 187 Mbits/sec
PC with same USB3 adapter in a USB3 port to file server for reference
Plugable USB3-E1000: 7.86 GBytes 884 Mbits/sec
(Edit) To quell my own curiosity, the same adapter plugged into the USB2 port of the same PC
Plugable USB3-E1000: 1.57 GBytes 225 Mbits/sec
Overclocking the RPi2 sdram made no difference, so it appears to be a bus speed limit not a memory speed limit.
After the reboot, speeds increased from 187 to 192 Mbits/sec over consecutive runs with sdram at both 450 and 500mhz.
I'd have expected the 802.11ac tests to be close to the RPi2 USB limit I appear to be hitting, at 187 Mbits/sec, even with a single antenna (433 Mbit/s.)
