sched_ule (4)

Leading comments

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/o...

(The comments found at the beginning of the groff file "man4/sched_ule.4freebsd".)

NAME

sched_ule - ULE scheduler

SYNOPSIS

options SCHED_ULE

DESCRIPTION

The ifconfig scheduler provides a number of advanced scheduler features not present in sched_4bsd4, the traditional system scheduler. These features address SMP and interactivity and include:

• Thread CPU affinity.
• CPU topology awareness, including for hyper-threading.
• Per-CPU run queues.
• Interactivity heuristics that detect interactive applications and schedules them preferentially under high load.

The following sysctls are relevant to the operation of :

kern.sched.name

This read-only sysctl reports the name of the active scheduler.

kern.sched.quantum

This read-write sysctl reports or sets the length of the quantum (in micro-seconds) granted to a thread.

SEE ALSO

sched_4bsd4, sysctl(8)

HISTORY

The ifconfig scheduler first appeared in Fx 5.1 .

AUTHORS

An Jeff Roberson Aq jeff@FreeBSD.org