[Solved] AMD EPYC 7413 slow down to around 400mhz when running iperf

[MadMatt]

@flaep

The Bios update did the trick, as far as i can tell.
After multiple reboots I still get around 20 Gbit/s with a single iperf thread. No throttling to 400 MHz. 39.6 Gbit/s with just two.

Good
for the governor change at boot, this should do:

The Ubuntu 18.04 CPU Frequency Governor Fix

So before, in Ubuntu 16.04 and below, /etc/init.d/ondemand was responsible for changing the CPU frequency to “ondemand” which caused issues while gaming with the processor downclocking. This is why Feral Interactive created Linux “GameMode” which sets the frequency governor to “performance” Trouble is, the fix is extremely simple… Just change echo…