Commit 3e3ede49 authored Feb 03, 2024 by Guilherme G. Piccoli Committed by Jonathan Corbet Feb 05, 2024

docs: Document possible_cpus parameter



The number of possible CPUs is set be kernel in early boot time through
some discovery mechanisms, like ACPI in x86. We have a parameter both
in x86 and S390 to override that - there are some cases of BIOSes exposing
more possible CPUs than the available ones, so this parameter is a good
testing mechanism, but for some reason wasn't mentioned so far in the
kernel parameters guide - let's fix that.

Cc: Changwoo Min <changwoo@igalia.com>
Signed-off-by: "Guilherme G. Piccoli" <gpiccoli@igalia.com>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20240203152208.1461293-1-gpiccoli@igalia.com

parent 932be49b

Documentation/admin-guide/kernel-parameters.txt

+5 −0

Original line number	Diff line number	Diff line
		@@ -4644,6 +4644,11 @@
		may be specified.
		Format: <port>,<port>....

		possible_cpus= [SMP,S390,X86]
		Format: <unsigned int>
		Set the number of possible CPUs, overriding the
		regular discovery mechanisms (such as ACPI/FW, etc).

		powersave=off [PPC] This option disables power saving features.
		It specifically disables cpuidle and sets the
		platform machine description specific power_save