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diff --git a/share/man/man4/sched_ule.4 b/share/man/man4/sched_ule.4 new file mode 100644 index 0000000..237535e --- /dev/null +++ b/share/man/man4/sched_ule.4 @@ -0,0 +1,83 @@ +.\" Copyright (c) 2005 Robert N. M. Watson +.\" All rights reserved. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. +.\" +.\" $FreeBSD$ +.\" +.Dd April 7, 2005 +.Os +.Dt SCHED_ULE 4 +.Sh NAME +.Nm sched_ule +.Nd ULE Scheduler +.Sh SYNOPSIS +.Cd "options SCHED_ULE" +.Sh DESCRIPTION +.Nm +is an experimental scheduler that provides a number of advanced scheduler +features not present in +.Xr sched_4bsd 4 , +the default system scheduler. +These features address SMP and interactivity and include: +.Pp +.Bl -bullet -compact -offset indent +.It +Thread CPU affinity. +.It +CPU topology awareness, including for hyper-threading. +.It +Per-CPU run queues. +.It +Interactivity heuristics that detect interactive applications and schedules +them preferentially under high load. +.El +.Pp +The following sysctls are relevant to the operation of +.Nm : +.Bl -tag -width indent +.It kern.sched.name +This read-only sysctl reports the name of the active scheduler. +.El +.Pp +.Nm +is disabled by default as it is experimental. +See the bugs section for more information. +.Sh SEE ALSO +.Xr sched_4bsd 4 , +.Xr sysctl 8 +.Sh HISTORY +The +.Nm +scheduler first appeared in +.Fx 5.1 . +.Sh AUTHORS +.An Jeff Roberson +.Aq jeff@FreeBSD.org +.Sh BUGS +As an experimental scheduler, +.Nm +is not enabled by default due to a number of known issues, including weak +performance with several known workloads, and reports of instability. +Deployment of +.Nm +in production environments should be done cautiously. |