---
title: "[W5100S-EVB-Pico]: iperf ??"
url: "https://maker.wiznet.io/forum/14656"
markdown_url: "https://maker.wiznet.io/forum/14656/md"
type: "Forum topic"
category: "Ethernet Chips"
author: "opcodex64"
created: "2022-09-22T19:47:47+09:00"
last_activity: "2022-09-26T02:28:05+09:00"
language: "en"
views: 447
replies: 1
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# [W5100S-EVB-Pico]: iperf ??

## Question

Asked by opcodex64 on 2022-09-22 in Ethernet Chips.

Hello Wiznet-Team,

I have to test the performance of the W5100S-EVB-Pico for TCP connection. Can you provide a clear “iperf” example ? Could not find it…

Thank you !

Best regards,
opcodex64

## Replies

### Reply 1 by opcodex64, 2022-09-23

Instead using iperf3, I have tried iperf as a server on the computer side and sending UDP packets from W5100S-EVB-PICO. It worked for me, but I could claim only 8-9MBit/s… I started another post ([\[W5100S-EVB-Pico\]: How to set PHY_SPEED to 100Mbit/s ?](https://forum.wiznet.io/t/topic/10232)) dealing with setting the board to 100MBit/s.

This post can be marked as “solved”.

---

Source: https://maker.wiznet.io/forum/14656