ESP32 Forum

I am starting a new project that requires and ESP32 variant and two ethernet ports. I like using the W5500 part but for this project I need 4k video throughput which is in the up to 30Mbps rate range. Performance reports I see for the W5500 seem to be in the 12Mbps range:
https://1byte.tistory.com/44
Not sure if I would need to double this for two ports or if the two SPI ports could run in parallel resulting in only a small hit for the second port. The problem remains that the W5500 seems to have too slow a performance for my needs.
I see other performance specs, this one claims rates of 80 Mbps using a ENC28J60 chip. The claim is it is a MAC internal vs external issue.
https://esp32.com/viewtopic.php?t=2013
Does anyone have any experience/comments with this?

See below for same performance comparison (for ESP32).
Achieving 80 Mbps with ENC28J60 chip is nonsense since this chip supports only 10Mbps link.

If you need two Ethernet ports, consider using https://github.com/espressif/esp-eth-dr ... /README.md

ESP_ondrej wrote: ↑

Mon Dec 11, 2023 8:01 am

If you need two Ethernet ports, consider using https://github.com/espressif/esp-eth-dr ... /README.md

Thank you. That microchip KSZ8863 looks like the part I need.

Just note that performance may vary. It is affected by your application code, cache misses, etc. Difference between KSZ8851 and W5500 is not that significant. Therefore, if I were you, I would also consider other factors (price, availability, etc.).

ESP_ondrej wrote: ↑

Tue Dec 12, 2023 9:55 am

Just note that performance may vary. It is affected by your application code, cache misses, etc. Difference between KSZ8851 and W5500 is not that significant. Therefore, if I were you, I would also consider other factors (price, availability, etc.).

I don't think the W5500 can work in the EMAC mode and I need the performance that it offers.

Could you please clarify what do you mean by W5500 EMAC mode?

ESP_ondrej wrote: ↑

Fri Dec 22, 2023 6:34 pm

Could you please clarify what do you mean by W5500 EMAC mode?

ESP_ondrej wrote: ↑

Mon Dec 11, 2023 8:01 am

See below for same performance comparison (for ESP32).

Code: [Select all] [Expand/Collapse]

1. +---------------------+---------+------------+---------+
2. | Proto / direction   |  EMAC   |  KSZ8851*  |  W5500* |
3. +---------------------+---------+------------+---------+
4. | TCP Rx [Mbps]       |  31     |        13  |      10 |
5. | TCP Tx [Mbps]       |  59     |        15  |      14 |
6. | UDP Rx [Mbps]       |  71     |        17  |      16 |
7. | UDP Tx [Mbps]       |  >80**  |        20  |      17 |
8. +---------------------+---------+------------+---------+
9.  
10. * @SPI 40 MHz
11. ** SW BW limit

GeSHi © Codebox Plus Extension

Achieving 80 Mbps with ENC28J60 chip is nonsense since this chip supports only 10Mbps link.

If you need two Ethernet ports, consider using https://github.com/espressif/esp-eth-dr ... /README.md

As I understand from the table you posted, to get rates in the 80 Mbps range I need to use the internal EMAC. Just using a W5500 can only give me UDP rates in the 20 Mbps which is not enough for my project.
I would rather use a part that gives me two ports in the foot print of the W5500 and the KSZ8863RLL seems to do that. The example you gave uses external magnetics. With a MAGJACK part this could be a very simple circuit.

The W5500 as I am using it handles the MAC in the W5500. It is not just the PHY part of the circuit.