Re: [lwip-users] Improving UDP responses.

[Erik Ekman]

MEMP_NUM_UDP_PCB is how many UDP sockets you can have.

Check the number of DMA buffers in the STM32 netif code. If you have
at least 6 for receiving, then it should be able to store that many
packets even if there is no time to read any of them out in between.
This should be unrelated to UDP and any group of packets arriving
quickly should see the same loss.

/Erik

On Tue, 21 Sept 2021 at 15:01, Luciano Moretti
<luciano.moretti@gmail.com> wrote:
>
> I've got an STM32F7 (SPL, not HAL) based project using LwIP RAW. We've got it 
> working fairly well, but it seems to handle 6 UDP packets very quickly and 
> then start dropping packets. I thought it was because of the MEMP_NUM_UDP_PCB 
> which was defined as 6, but increasing it to 12 has had no effect.
>
> Can you make any other recommendations as to how to increase our throughput?
>
> Thank you,
> Luciano
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