What is maximum eth MTU size on Khadas Vim3?

VIM3
1

Hello,

I’m using:

Distributor ID: Ubuntu
Description: Ubuntu 24.04 LTS
Release: 24.04
Codename: noble

Linux khadasvim 5.15.119 #1.6.9.1 SMP PREEMPT Thu Jun 20 09:22:43 CST 2024 aarch64 aarch64 aarch64 GNU/Linux

I need to increase eth0 MTU size up to 9000,
and i’m try to:

sudo ip link set dev eth0 mtu 9000

Error: mtu greater than device maximum.

same error up to 3700.

3600:

sudo ip link set dev eth0 mtu 3600

[ 313.035668][2 T1044 …] meson8b-dwmac ff3f0000.ethernet eth0: must be stopped to change its MTU
RTNETLINK answers: Device or resource busy

What is maximum MTU on eth0 ethernet interface?

Is it possible set up to 9000 for example?

Thank you in advance!

2

Hello @sergetsp
You can set the mtu value using the following method,the maximum value is 2000.

sudo ifconfig eth0 down
sudo ifconfig eth0 mtu 2000
sudo ifconfig eth0 up
3

Thank you for reply.

Is the hardware or software limitation (up to 2000)?

I know that the modern eth controllers have 9000 or bigger mtu size.

4

@sergetsp
The maximum limit set by the software is 2000

5

Is it the same for the VIM4?

6

Hello @nkhedekar

Yes, it is the same for the VIM4

1 Like
7

Hello,

how (where) is it possible to change it if it software settings?
(kernel source)?