---
title: "TCPIP vs external interrupt"
url: "https://maker.wiznet.io/forum/12835"
markdown_url: "https://maker.wiznet.io/forum/12835/md"
type: "Forum topic"
category: "General"
author: "adamlevine"
created: "2018-04-05T00:08:34+09:00"
last_activity: "2018-04-05T00:08:34+09:00"
language: "en"
views: 822
replies: 0
source: "WIZnet Makers forum (https://maker.wiznet.io/forum/)"
---

# TCPIP vs external interrupt

## Question

Asked by adamlevine on 2018-04-05 in General.

TCPIP vs external interrupt

Why running TCPIP inserts random delays into the external interrupt response time. External interrupt has priority 7 and uses SRS. Nothing else with priority 7. The TCPIP server is a Harmony example.
If the server is not running, the external interrupt delay is constant (1us).
After starting the server, it changes between 1 - 2 us.
I do not know what to try anymore.

---

Source: https://maker.wiznet.io/forum/12835