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A tickless kernel is an operating system kernel in which timer interrupts do not occur at regular intervals, but are only delivered as required.[1]
The Linux kernel on s390 from 2.6.6[2] and on i386 from release 2.6.21[3] can be configured to turn the timer tick off (tickless or dynamic tick) for idle CPUs using CONFIG_NO_HZ, and from 3.10 with CONFIG_NO_HZ_IDLE extended for non-idle processors with CONFIG_NO_HZ_FULL.[4] The XNU kernel from Mac OS X 10.4 on, and the NT kernel from Windows 8 on, are also tickless.[1] The Solaris 8 kernel introduced the cyclic subsystem which allows arbitrary resolution timers and tickless operation.[5] FreeBSD 9 introduced a "dynamic tick mode" (aka tickless).[6]
As of 2020, there is a plan to add this to MINIX 3[7] in the medium term.[8]
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