Best ethernet config for benchamrking on STM32H753

[g2f1]

Hello, I hope you are doing well.

I am currently working on benchmarking the Ethernet communication interface on an STM32H753 Nucleo board.

My setup involves sending data from a Python script to the STM32, where the data is encrypted, and then sent back. This allows me to measure the RTT and overall throughput.

I initially used Mongoose, but I encountered several issues:

• With UDP, I cannot reliably send more than ~1500 bytes, since larger packets get fragmented or dropped.
• TCP works correctly, but the throughput varies significantly depending on payload size. For example:
  • ~2.7 MiB/s for 1400-byte payloads
  • ~7 MiB/s for 10240-byte payloads

I would like to know:

1. What is the best networking stack or library for STM32 to achieve better performance and properly handle UDP large payloads?
2. Given that Ethernet is 100 Mbps in my case, I am not reaching near-theoretical throughput even without encryption. Is this because I am measuring not only transmission time but also packet handling, buffering, and processing overhead (e.g., encryption, stack processing)? Is this assumption correct?

Thank you  

[mbarg.1]

Well. I find your question very nice.

We faced the similar problem - we wanted to have a reliable websockets conenction with a bunch (<16) of clients on IP4 and IP6 while flooding the interface with classicl flood of sync.

We were unable to get both freertos and azure stable - our fault probably - and we decided to move to a proprietary solution built on top of azure rtos and STM HAL without netxDuo.

If you mind, I can share the code, but be aware we can do only if you are based in a non-conflict area.

Let me know.

[g2f1]

Hello, what you mean by non-conflict area?

[mbarg.1]

Unfortunately today we see countries invading other countries, pirates assaulting vessels, and many other similar situations.

I do love peace and I share know how as my part of reducing possibles causes of disagreement between humans.

Double check that this know how is used only to increase chances of peace is mandatory.

[Pavel A.]

This expert posted insightful tips on performance of ETH in STM32H7. Long time haven't seen him here, regretfully.

How to make Ethernet and lwIP working on STM32 - STMicroelectronics Community

[Zhiyong Li]

Hi,

Try to take a look at the Composite EMAC driver in Mbed-CE. Jamie did a great job re-implementing the original EMAC driver from STM. I have seen some significant performance boost from discussion here. Jamie had been looking for some real world use-cases that require high performance in embedded system. I am sure he would love to see how it works in your project.

BR,

ZL

[Zhiyong Li]

Quote from Jamie, he was able to get up to 98Mbs with 100Mbs setup. Please drop a line here, we, both Jamie and me, would be happy to help you setup and see how it works for your project.