From nobody Wed Feb 11 05:17:37 2026 X-Original-To: dev-commits-src-branches@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4f9msF5p4hz6Rtww for ; Wed, 11 Feb 2026 05:17:37 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R13" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4f9msF42lYz3T01 for ; Wed, 11 Feb 2026 05:17:37 +0000 (UTC) (envelope-from git@FreeBSD.org) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1770787057; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=AS0dbJi+CqK2blIEJ0TVWS05t5ejiGY2JTeMVQx0ehM=; b=pfVF8Oby1KktCEigyWniE4RQC6anUTkwbYr9BUsAGbN866lil0851aZr3T5Pp4VUTZJRLj jL19BJozSt5p1f8Lj3ZLxcJewNORrKn1Mmkc83BsE+DsmbScL5HDVf7vtVVIqR70xuHeYP yN9TK+QPR3zFWqxhMbI8cLZH4oxaKiZjG33SgiQ+slSIsuVEEzX7eJPmBGhxyabiPkXDby 5zRKLvZ6GgHSNzsYFS6E9wzxnkA2pASGfYbudLuQgCHLy/i6Jo+0z1rzBWSd0RT6VwXH/9 AnFPCN8hT1uJSJbgc34NPwy3KSqFD3nNPgoP5kpHMql5YSbd42MVDxiUe9EqlA== ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1770787057; a=rsa-sha256; cv=none; b=LBGMe/8m6Qk/mgEExOJBQegtfA3gsEtReIYVV3KLo9aZM7nEpFPQ1gdj6ignBMJ3vHMc5C 68E2FhtNtyw89lfgLdpZjycCvDdeDg6AnM2UCGuPGYM9dqdM5rnSs0qcemuwNkjKjxToee GRUP35GfXWSFha+779dXQ7QBfvgnmpmbPNXMCyWnEjU8pgPg6Brbm8nF5xEXTb4/blL9SI GYH8tdlM8fKi5q+cAjth3MsN/rYzxk6VZ9xRazqhXM7o/F53dauJ5My3MivhciSJBs0jyX E0HuIb4dInLAskQfvgzuDHKlKeavC+hQwiHGkKLYP6q+g0G1ZutaYIA8qHovgw== ARC-Authentication-Results: i=1; mx1.freebsd.org; none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1770787057; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=AS0dbJi+CqK2blIEJ0TVWS05t5ejiGY2JTeMVQx0ehM=; b=D/6P7zZhbRfvkxCKru1ortGiLVIy+Lvqf/MegYkFSrDsWQFW9oBEuZZ4x7TrBxBmFEnL1k 7ec1083BYapjlmXAsEJEDA60WnaV1flGsRkRZI1GiVSzkEt7QbKcIY7eafEqBqlC5fbYPd vXqvw34B9IseVCRGOPv7Pv4cWmcSbusLBcRMuL14FpPXMQnjdEOj519dOq/oufyGM/no0j EWHcVTZydS0ePqkKpzCs4KbpJPOgHFVdDROf11tGVS++6bFPuII7mHyrWGba7PiSDORNrl JiPV3JjlsZ5G1zlIo/LmLh3FHaNd33iVR4TLmBfLyusP1RTWHZB5ZYsIvOMaRg== Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) by mxrelay.nyi.freebsd.org (Postfix) with ESMTP id 4f9msF3bcszcYx for ; Wed, 11 Feb 2026 05:17:37 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from git (uid 1279) (envelope-from git@FreeBSD.org) id 2670b by gitrepo.freebsd.org (DragonFly Mail Agent v0.13+ on gitrepo.freebsd.org); Wed, 11 Feb 2026 05:17:37 +0000 To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org From: Konstantin Belousov Subject: git: 4e5c15f3107e - stable/15 - tuning.7: document schedulers knobs List-Id: Commits to the stable branches of the FreeBSD src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-branches List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: dev-commits-src-branches@freebsd.org Sender: owner-dev-commits-src-branches@FreeBSD.org MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: kib X-Git-Repository: src X-Git-Refname: refs/heads/stable/15 X-Git-Reftype: branch X-Git-Commit: 4e5c15f3107e8c288bab3bfc5a9607c492e4c65d Auto-Submitted: auto-generated Date: Wed, 11 Feb 2026 05:17:37 +0000 Message-Id: <698c10f1.2670b.2f28d179@gitrepo.freebsd.org> The branch stable/15 has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=4e5c15f3107e8c288bab3bfc5a9607c492e4c65d commit 4e5c15f3107e8c288bab3bfc5a9607c492e4c65d Author: Konstantin Belousov AuthorDate: 2026-01-29 21:40:29 +0000 Commit: Konstantin Belousov CommitDate: 2026-02-11 05:12:37 +0000 tuning.7: document schedulers knobs (cherry picked from commit 0730a05cd383276ca8eedf295509e869ac9b88a0) --- 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.