From Fedora Project Wiki

Tickless kernel


Make the default x86_64 kernel tickless.


  • Names: DaveJones, IngoMolnar

Current status

  • Last modified: [[DateTime(2007-08-20 T19:00:03Z)]
  • Targeted release: Fedora 8
  • Percentage of completion: 100%

x86_64 tickless is now in rawhide.

Detailed Description

Benefit to Fedora

  • Improves power management by not waking up 100 (or 1000, or whatever) times a second.


  • Kernel changes

Test Plan

  • Examine built kernel config, make sure CONFIG_NO_HZ is set.
  • Boot kernel ; use powertop or similar software to determine that it is running in a tickless manner.

User Experience

  • Should not affect user's experience in a noticeable way, aside from increasing battery life.


  • Depends on upstream kernel work.

Contingency Plan

  • Back out the tickless patch, or build without CONFIG_NO_HZ


Should not be needed.

Release Notes

Should not be needed.