Slow speed with RPi 3B+ and gig ethernet

[ajp2k14]

I have the exact same performance problem when connecting my Pi 3B+ to my Asus AC86U (Merlin 384.9) using ethernet...

https://www.raspberrypi.org/forums/viewtopic.php?f=63&t=208512&p=1297857#p1297857

@RMerlin or anyone else for that matter, do you know of anything I could try to resolve this with my AC86U? Does it have flow control enabled on the switch?

Thanks!

 

[ajp2k14]

I bought a 5-port TP-link switch which I connected the Pi to instead of directly to the AC86U, no difference. Then I disovered that the switch had a web interface where I could enable flow control for each port so I enabled it for the Pi-port, the iperf3 speeds then went from 70-ish Mbps to 230Mbps+...

Is there something like flow control on the AC86U switch hardware?

 

[ajp2k14]

I see it's been discussed here before, should have searched better. Seems still no solution though...

 

[unsynaps]

Just a question. What speed are you expecting?

If you did not know Ethernet on the Pi 3B+ (like all other Pi's) run off the USB 2.0 bus. This means while you will get a gig (on the 3B+) link you will NEVER get gig speed. You will max out at a theoretical 480 megabits per second because that is the fastest USB 2.0 goes.

 

[elorimer]

The 3B+ is spec'd at a maximum 300.