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tuning.7: document schedulers knobs

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Reviewed by:	emaste, olce, ziaee
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D54951
This commit is contained in:
Konstantin Belousov
2026-01-29 23:40:29 +02:00
parent 4b32fdb4a6
commit 0730a05cd3
1 changed files with 26 additions and 0 deletions
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@@ -601,6 +601,32 @@ See the
section in the section in the
.Xr sendfile 2 .Xr sendfile 2
manual page for details. manual page for details.
.Sh SCHEDULERS
.Fx
allows having more than one scheduler specified in the kernel config,
and the desired scheduler selected from them at boot time.
Right now the options are:
.Bl -tag -width SCHED_4BSD
.It Cd SCHED_ULE
The modern scheduler with O(1) thread selection behavior.
.It Cd SCHED_4BSD
Classic scheduler inherited from 4.x BSD.
.El
.Pp
At least one option must be specified.
.Cd SCHED_ULE
is used by default if compiled in.
.Pp
The
.Va kern.sched.available
sysctl provides the comma-separated list of available (compiled in)
schedulers.
The
.Va kern.sched.name
loader tunable can be set to select the desired scheduler at boot time.
The
.Va kern.sched.name
sysctl reports which scheduler is used.
.Sh KERNEL CONFIG TUNING .Sh KERNEL CONFIG TUNING
There are a number of kernel options that you may have to fiddle with in There are a number of kernel options that you may have to fiddle with in
a large-scale system. a large-scale system.