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