htamas
Posts: 1
Joined: Tue Jun 12, 2018 8:33 am

RPi 3B+ Gigabit Ethernet Slow Download Speeds

Tue Jun 12, 2018 9:09 am

Hi!

A few days ago I replaced my RPi 3 with USB Gigabit Ethernet adapter to a new RPi 3B+ and i wanted to use it without the adapter.
Sadly my download speed measurements with speedtest-cli show slow download speeds.
Upload speeds are ok. I use the lastest version of Raspbian.

My ISP's download speed: 220Mb/s and upload speed is: 20Mb/s
Does it have to be like this or have someone managed to get better results?

RPi3 B+:
The attachment RPI_3B+.PNG is no longer available
RPi3 with adapter and the last days with RPi3 B+: (I changed provider in February)
RPI_3B+.PNG
RPI_3B+.PNG (9.71 KiB) Viewed 1365 times

jamesh
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 22671
Joined: Sat Jul 30, 2011 7:41 pm

Re: RPi 3B+ Gigabit Ethernet Slow Download Speeds

Tue Jun 12, 2018 9:20 am

Flow control on the router needs to be turned on for best performance.

I would expect between 180 and 250Mbits/sto be achieved. You cannot get 1Gbits/s since the ethernet chip is connected by a USB connection which has a max rate of 480Mbits/s and you have to take overhead off that as well, but it should be clearly faster than the 100baseT.
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