---
title: client.socket.tcpi_min_rtt
summary: null
url: >-
  https://www.fastly.com/documentation/reference/vcl/variables/client-connection/client-socket-tcpi-min-rtt
---

**Type:** INTEGER  
**Access:** read-only

**Available in:** recv, deliver, log, error

The smallest round trip time (RTT) measurement observed on the
current connection. It is in microseconds. The RTT for a connection
may rise over time due to buffering in the network and in such cases
the minimum observed RTT provides a different indication of the best
case path RTT.