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charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: kib X-Git-Repository: src X-Git-Refname: refs/heads/main X-Git-Reftype: branch X-Git-Commit: 0730a05cd383276ca8eedf295509e869ac9b88a0 Auto-Submitted: auto-generated Date: Thu, 29 Jan 2026 22:44:03 +0000 Message-Id: <697be2b3.3bff0.21b186d1@gitrepo.freebsd.org> The branch main has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=0730a05cd383276ca8eedf295509e869ac9b88a0 commit 0730a05cd383276ca8eedf295509e869ac9b88a0 Author: Konstantin Belousov AuthorDate: 2026-01-29 21:40:29 +0000 Commit: Konstantin Belousov CommitDate: 2026-01-29 22:43:45 +0000 tuning.7: document schedulers knobs Reviewed by: emaste, olce, ziaee Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D54951 --- share/man/man7/tuning.7 | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/share/man/man7/tuning.7 b/share/man/man7/tuning.7 index c03cce0aba0f..586b63c247a8 100644 --- a/share/man/man7/tuning.7 +++ b/share/man/man7/tuning.7 @@ -601,6 +601,32 @@ See the section in the .Xr sendfile 2 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 There are a number of kernel options that you may have to fiddle with in a large-scale system.