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x86: change maximum NR_CPUS to 4096 and MAX_NUMNODES to 512

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* 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: Mike Travis <travis@sgi.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Dave Jones <davej@codemonkey.org.uk>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Mike Travis 2008-05-16 10:44:39 -07:00 committed by Thomas Gleixner
parent f8096f92b8
commit c3ed64295f
1 changed files with 6 additions and 6 deletions
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12
arch/x86/Kconfig
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@ -565,18 +565,18 @@ config IOMMU_HELPER
def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB) def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB)
config NR_CPUS config NR_CPUS
int "Maximum number of CPUs (2-255)" int "Maximum number of CPUs (2-4096)"
range 2 255 range 2 4096
depends on SMP depends on SMP
default "32" if X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000 default "32" if X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000
default "8" default "8"
help help
This allows you to specify the maximum number of CPUs which this 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. minimum value which makes sense is 2.
This is purely to save memory - each supported CPU adds 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 config SCHED_SMT
bool "SMT (Hyperthreading) scheduler support" bool "SMT (Hyperthreading) scheduler support"
@ -968,8 +968,8 @@ config NUMA_EMU
number of nodes. This is only useful for debugging. number of nodes. This is only useful for debugging.
config NODES_SHIFT config NODES_SHIFT
int "Max num nodes shift(1-15)" int "Max num nodes shift(1-9)"
range 1 15 if X86_64 range 1 9 if X86_64
default "6" if X86_64 default "6" if X86_64
default "4" if X86_NUMAQ default "4" if X86_NUMAQ
default "3" default "3"