Increase the limit of NR_CPUS to 4096 and introduce a boolean called "MAXSMP" which when set (e.g. "allyesconfig"), will set NR_CPUS = 4096 and NODES_SHIFT = 9 (512). Based on: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git git://git.kernel.org/pub/scm/linux/kernel/git/x86/linux-2.6-x86.git Signed-off-by: Mike Travis --- arch/x86/Kconfig | 20 ++++++++++++++++---- 1 file changed, 16 insertions(+), 4 deletions(-) --- linux.trees.git.orig/arch/x86/Kconfig +++ linux.trees.git/arch/x86/Kconfig @@ -522,16 +522,24 @@ config SWIOTLB access 32-bits of memory can be used on systems with more than 3 GB of memory. If unsure, say Y. +config MAXSMP + bool "Configure Maximum number of SMP Processors" + depends on X86_64 && SMP + default n + help + Configure maximum number of CPUS for this architecture. + If unsure, say N. 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 "4096" if MAXSMP 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 @@ -918,12 +926,16 @@ config NUMA_EMU number of nodes. This is only useful for debugging. config NODES_SHIFT - int "Max num nodes shift(1-15)" + int "Maximum NUMA Nodes (as a power of 2)" range 1 15 if X86_64 + default "9" if MAXSMP default "6" if X86_64 default "4" if X86_NUMAQ default "3" depends on NEED_MULTIPLE_NODES + help + Specify the maximum number of NUMA Nodes available on the target + system. Increases memory reserved to accomodate various tables. config HAVE_ARCH_BOOTMEM_NODE def_bool y -- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/