Commit c3ed6429 authored by Mike Travis's avatar Mike Travis Committed by Thomas Gleixner
Browse files

x86: change maximum NR_CPUS to 4096 and MAX_NUMNODES to 512 



  * Change the range of NR_CPUS from 2-255 to 2-4096 and change the
    range of MAX_NUMNODES (NODES_SHIFT) from 1-32768 to 1-512.

  * Alter comment about how much each increment of NR_CPUS consumes.
    (This was found by configuring for 256 cpus and then 512 cpus
     and dividing the difference by 256.)

Signed-off-by: default avatarMike Travis <travis@sgi.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Dave Jones <davej@codemonkey.org.uk>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent f8096f92

arch/x86/Kconfig

+6 −6
Original line number Diff line number Diff line
@@ -565,18 +565,18 @@ config IOMMU_HELPER 
	def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB)



config NR_CPUS

	int "Maximum number of CPUs (2-255)"

	range 2 255

	int "Maximum number of CPUs (2-4096)"

	range 2 4096

	depends on SMP

	default "32" if X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000

	default "8"

	help

	  This allows you to specify the maximum number of CPUs which this

	  kernel will support.  The maximum supported value is 255 and the

	  kernel will support.  The maximum supported value is 4096 and the

	  minimum value which makes sense is 2.



	  This is purely to save memory - each supported CPU adds

	  approximately eight kilobytes to the kernel image.

	  approximately one kilobyte to the kernel image.



config SCHED_SMT

	bool "SMT (Hyperthreading) scheduler support"
@@ -968,8 +968,8 @@ config NUMA_EMU 
	  number of nodes. This is only useful for debugging.



config NODES_SHIFT

	int "Max num nodes shift(1-15)"

	range 1 15  if X86_64

	int "Max num nodes shift(1-9)"

	range 1 9  if X86_64

	default "6" if X86_64

	default "4" if X86_NUMAQ

	default "3"

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