sched_4bsd man page on FreeBSD

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SCHED_4BSD(4)		 BSD Kernel Interfaces Manual		 SCHED_4BSD(4)

     sched_4bsd — 4.4BSD scheduler

     options SCHED_4BSD

     The sched_4bsd scheduler is the traditional system scheduler, providing
     both high throughput and solid interactive response in the presence of

     The following sysctls are relevant to the operation of sched_4bsd:
	     This read-only sysctl reports the name of the active scheduler.

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

	     This read-write sysctl sets whether or not the scheduler will
	     generate an inter-processor interrupt (IPI) to an idle CPU when a
	     thread is woken up.  Otherwise, idle CPUs will wait until the
	     next clock tick before looking for new work.

	     This read-only sysctl reports whether or not the kernel is con‐
	     figured to support preemption, which reduces the latency to run
	     lower priority threads on wakeup.

     Some sysctls will be available only on systems supporting SMP.

     sched_ule(4), sysctl(8)

     The sched_4bsd scheduler has been present, in various forms, since the
     inception of BSD.

     While a highly robust and time-tested scheduler, sched_4bsd lacks spe‐
     cific knowledge of how to schedule advantageously in non-symmetric pro‐
     cessor configurations, such as hyper-threading.

BSD			       January 21, 2008				   BSD

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