LWIP loss small packets in high rate

[ranran]

Hi,

This is not an STM32 question, but more related to LWIP. Yet, maybe someone here will have an idea.

We use LWIP AS-IS from the example, and we test the Ethernet receive in high load with udp packets.

We see that when send from the tester device small packets ( less then 450 bytes), in high rate into the stm32, it gets into LWIP drop packet, because pcb is null. I thought that maybe there are not enough PCB, to I tried to increase UDP PCB packets, but I get the same results.

Thanks,

ranran

[Ozone]

I would measure the system load, especially of the ethernet handling routines (interrupt or DMA) in relation to arriving metwork packages.

I suspect an overload.