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NOTE: This page is outdated, dynamic ticks are now supported in
the mainline Linux kernel, see CONFIG_NO_HZ.

Dynamic Tick Timer for Linux (dyn-tick) makes the HZ dynamic. When
using dyn-tick, the system runs at full HZ during load, and skips
ticks when possible while idle.

This allows extra power saving measures to be taken during the longer
idle periods. On a PC, the HZ can vary between 6Hz during idle and
1000Hz during load.

Dyn-tick was originally implemented for TI's OMAP ARM architecture,
and has been in use in the linux-omap tree since October 2004.

Dyn-tick is based on earlier similar implementations, mostly
on the 2.4 VST patch of the Linux High Resolution Timers project,
and 2.6 s390 NO_IDLE_HZ patch.

Tools:
pmstats-0.3.gz
pmstats-0.2.gz
pmstats-0.1.gz
timetest.gz
dyntick-test.c



Con Colivas has the most recent dynamic tick patches for x86 on his
website

Older dyn-tick patches for x86:
patch-dynamic-tick-2.6.12-rc6-050610-1
patch-dynamic-tick-debug-2.6.12-rc6-050610-1

Older dyn-tick patches for x86:
patch-dynamic-tick-2.6.12-rc6-050609-2
patch-dynamic-tick-debug-2.6.12-rc6-050609-1
patch-dynamic-tick-2.6.12-rc5-050602-2
patch-dynamic-tick-2.6.12-rc5-050602-1
patch-dynamic-tick-2.6.12-rc2-050408-1
patch-dynamic-tick-2.6.12-rc2-050406-1
patch-dynamic-tick-2.6.11-rc2-050127-1
patch-dynamic-tick-2.6.11-rc1-050125-1
patch-dynamic-tick-2.6.11-rc1-050118-1

Dyn-tick for ARM has been integrated to the mainline tree after 2.6.13-rc1:
Generic ARM dyn-tick support
SA_TIMER flags
Idle loop call
ARM OMAP dyn-tick support

Other links:
Linux High Resolution Timers Project
s390 NO_IDLE_HZ patch
First dyn-tick patch thread on LKML
Second dyn-tick patch thread on LKML
Search LKML for dynamic tick


          
        
          

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