The passing of time is important to Linux kernel. To understand how Linux kernel timer and time management works, there are a few things to know.

Linux kernel timer

In this post, I will go throught some terminologies and examples. (To be completed)

Terminologies /basic concepts

kernel notion fo time: tick

Tick Rate: HZ


kernel timer

Delaying executions

Busy looping

Samll delay



  • netperf:
  • iperf:
  • nuttcp: