19b99e9b9SRobert Watson.\" Copyright (c) 2005 Robert N. M. Watson 29b99e9b9SRobert Watson.\" All rights reserved. 39b99e9b9SRobert Watson.\" 49b99e9b9SRobert Watson.\" Redistribution and use in source and binary forms, with or without 59b99e9b9SRobert Watson.\" modification, are permitted provided that the following conditions 69b99e9b9SRobert Watson.\" are met: 79b99e9b9SRobert Watson.\" 1. Redistributions of source code must retain the above copyright 89b99e9b9SRobert Watson.\" notice, this list of conditions and the following disclaimer. 99b99e9b9SRobert Watson.\" 2. Redistributions in binary form must reproduce the above copyright 109b99e9b9SRobert Watson.\" notice, this list of conditions and the following disclaimer in the 119b99e9b9SRobert Watson.\" documentation and/or other materials provided with the distribution. 129b99e9b9SRobert Watson.\" 139b99e9b9SRobert Watson.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 149b99e9b9SRobert Watson.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 159b99e9b9SRobert Watson.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 169b99e9b9SRobert Watson.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 179b99e9b9SRobert Watson.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 189b99e9b9SRobert Watson.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 199b99e9b9SRobert Watson.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 209b99e9b9SRobert Watson.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 219b99e9b9SRobert Watson.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 229b99e9b9SRobert Watson.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 239b99e9b9SRobert Watson.\" SUCH DAMAGE. 249b99e9b9SRobert Watson.\" 259b99e9b9SRobert Watson.\" $FreeBSD$ 269b99e9b9SRobert Watson.\" 279b99e9b9SRobert Watson.Dd April 7, 2005 289b99e9b9SRobert Watson.Os 299b99e9b9SRobert Watson.Dt SCHED_ULE 4 309b99e9b9SRobert Watson.Sh NAME 319b99e9b9SRobert Watson.Nm sched_ule 329b99e9b9SRobert Watson.Nd ULE Scheduler 339b99e9b9SRobert Watson.Sh SYNOPSIS 349b99e9b9SRobert Watson.Cd "options SCHED_ULE" 359b99e9b9SRobert Watson.Sh DESCRIPTION 369b99e9b9SRobert Watson.Nm 379b99e9b9SRobert Watsonis an experimental scheduler that provides a number of advanced scheduler 389b99e9b9SRobert Watsonfeatures not present in 399b99e9b9SRobert Watson.Xr sched_4bsd 4 , 409b99e9b9SRobert Watsonthe default system scheduler. 419b99e9b9SRobert WatsonThese features address SMP and interactivity and include: 429b99e9b9SRobert Watson.Pp 439b99e9b9SRobert Watson.Bl -bullet -compact -offset indent 449b99e9b9SRobert Watson.It 459b99e9b9SRobert WatsonThread CPU affinity. 469b99e9b9SRobert Watson.It 479b99e9b9SRobert WatsonCPU topology awareness, including for hyper-threading. 489b99e9b9SRobert Watson.It 499b99e9b9SRobert WatsonPer-CPU run queues. 509b99e9b9SRobert Watson.It 519b99e9b9SRobert WatsonInteractivity heuristics that detect interactive applications and schedules 529b99e9b9SRobert Watsonthem preferentially under high load. 539b99e9b9SRobert Watson.El 549b99e9b9SRobert Watson.Pp 559b99e9b9SRobert WatsonThe following sysctls are relevant to the operation of 569b99e9b9SRobert Watson.Nm : 579b99e9b9SRobert Watson.Bl -tag -width indent 589b99e9b9SRobert Watson.It kern.sched.name 599b99e9b9SRobert WatsonThis read-only sysctl reports the name of the active scheduler. 609b99e9b9SRobert Watson.El 619b99e9b9SRobert Watson.Pp 629b99e9b9SRobert Watson.Nm 639b99e9b9SRobert Watsonis disabled by default as it is experimental. 649b99e9b9SRobert WatsonSee the bugs section for more information. 659b99e9b9SRobert Watson.Sh SEE ALSO 669b99e9b9SRobert Watson.Xr sched_4bsd 4 , 679b99e9b9SRobert Watson.Xr sysctl 8 689b99e9b9SRobert Watson.Sh HISTORY 699b99e9b9SRobert WatsonThe 709b99e9b9SRobert Watson.Nm 719b99e9b9SRobert Watsonscheduler first appeared in 729b99e9b9SRobert Watson.Fx 5.1 . 739b99e9b9SRobert Watson.Sh AUTHORS 749b99e9b9SRobert Watson.An Jeff Roberson 759b99e9b9SRobert Watson.Aq jeff@FreeBSD.org 769b99e9b9SRobert Watson.Sh BUGS 779b99e9b9SRobert WatsonAs an experimental scheduler, 789b99e9b9SRobert Watson.Nm 799b99e9b9SRobert Watsonis not enabled by default due to a number of known issues, including weak 809b99e9b9SRobert Watsonperformance with several known workloads, and reports of instability. 819b99e9b9SRobert WatsonDeployment of 829b99e9b9SRobert Watson.Nm 839b99e9b9SRobert Watsonin production environments should be done cautiously. 84