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I am currently attemping to run iperf3 between two 1000Mb capable ethernet devices, a Raspberry Pi 4 running OSMC (a Debian based Media Server distro) and a Dell XPS 15 laptop running Ubuntu.

The devices are connected to a Gigabit switch using cat 6 cables.

On both devices, running this command:

ethtool eth0 | grep Speed

Returns:

Speed: 1000Mb/s

However, iperf3 is only returning results of about 94Mb/s

I have tried changing the cables and the switch, didn't help. I even tried this cmd:

ethtool -s enxe4b97ac6101b speed 1000 duplex full autoneg off

Which I rolled back as it actually slowed the speed down to about 75Mb/s.

Any suggestions how I can increase the speed?

Thank you

BrettSh

BrettSh
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1 Answers1

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Well... seems the issue is I was swapping out the wrong cables.

In other words, I'm an idiot who needs to label his home Ethernet cables.

BrettSh
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  • While you are at it, get rid of "economy" two-pair (four-wire) cables. They're nothing but trouble. – Zac67 Aug 07 '22 at 10:47
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    Thanks @Zac67. In fact, that _was_ the problem. I inspected all the patch cables in my home network to ensure they were cat 5e or cat 6 and I found a crappy 2 pair cable. It went straight in the bin. – BrettSh Aug 08 '22 at 11:29