how to change MTU size > 1500 in imx8m mini

[zhouyq]

Hi,

we need to change MTU size more than 1500 default on imx8m mini, such as 9000.

I refer to the contents of the two posts to modify my kernel and fec driver, but it does not work.

Solved: Re: How to set jumbo frame? - NXP Community

[PATCH/RFC,net-next] net: fec: allow "mini jumbo" frames - Patchwork (kernel.org)

Although I can set mtu to 9000, but he can't communicate normally.

I have confirmed that the mtu of the target machine has been set to 9000, and can be pinged through with the "-s 9000" parameter.

Regards,

zhouyq

[b36401]

Actually jumbo frames are not supported hardware way. The onboard FIFO was not sized for jumbo frames.
So it is not recommended to use jumbo frames on i.MX8MMini.
I mean even if you configure it somehow you may get performance loose.

[zhouyq]

Yes, I tried to support the jumbo frame of the onboard network card in the driver, and after the system started, I used "ifconfig" to see that it was configured to 9000, but it did not work properly. Is there a solution to this problem?

Thanks.