wtschueller

Maybe related: I can trigger the "NETDEV WATCHDOG: eth0 (bcmgenet): transmit queue x timed out" using MTU sweep like this: `for ((MTU=2000; MTU

@graysky2 I do not see checksum errors in dmesg. See below. Here is what I have tried already: **kernel 5.10.17-v8 aarch64:** Basically same behaviour. Wireshark shows some transfers from RPi4...

I found an even faster way to trigger the transmit queue time out: UDP packet sweeping like this ``` for ((MTU=2024; MTU>8192; ((MTU=MTU-4)) )) do sudo ifconfig eth0 mtu ${MTU}...

No real progress in the mean time. A can trigger the time out only by sending packets of size 2049 ... 2093 bytes. No single time out if MTU is...

@pelwell - Could you have a look please? I saw your commit [phy: broadcom: Add bcm54213pe configuration](https://github.com/raspberrypi/linux/commit/a49a9425133aac8c2995ff0eeead99ef868863af). There is a function [bcm_phy_enable_jumbo()](https://github.com/raspberrypi/linux/blob/rpi-5.15.y/drivers/net/phy/bcm-phy-lib.c#L612), so I guess there could be additional settings...

@pelwell Thank you. Ok, I blindly assumed that you have access to the documentation. Maybe you could point me in the right direction. I hope that if we know what...

Still no real progress. 06d836801cd82ded282aaf9e888ff9e7e4a88b91 does not help in my case.