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| author |   Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2015-05-08 13:25:45 +0300 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2015-05-08 12:58:56 +0200 |
| commit | c5c19941ad1bb18f010ae47f1db333c00b276d55 (patch) | |
| tree | 4195e44a4ca844096053f055e6076d2f84c082af /arch/x86/Kconfig | |
| parent | Merge tag 'pm+acpi-4.1-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm (diff) | |
| download | linux-dev-c5c19941ad1bb18f010ae47f1db333c00b276d55.tar.xz linux-dev-c5c19941ad1bb18f010ae47f1db333c00b276d55.zip | |
x86/kconfig: Bump default NR_CPUS from 8 to 64 for 64-bit configuration
Default NR_CPUS==8 is not enough to cover high-end desktop
configuration: Haswell-E has upto 16 threads.
Let's increase default NR_CPUS to 64 on 64-bit configuration.
With this value CPU bitmask will still fit into one unsigned long.
Default for 32-bit configuration is still 8: it's unlikely
anybody will run 32-bit kernels on modern hardware.
As an alternative we could bump NR_CPUS to 128 to cover all
dual-processor servers with some margin.
For reference: Debian and Suse build their kernels with
NR_CPUS==512, Fedora -- 1024.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1431080745-19792-1-git-send-email-kirill.shutemov@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/Kconfig')
| -rw-r--r-- | arch/x86/Kconfig | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 226d5696e1d1..83cd1c7aa409 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -851,7 +851,8 @@ config NR_CPUS default "1" if !SMP default "8192" if MAXSMP default "32" if SMP && X86_BIGSMP - default "8" if SMP + default "8" if SMP && X86_32 + default "64" if SMP ---help--- This allows you to specify the maximum number of CPUs which this kernel will support. If CPUMASK_OFFSTACK is enabled, the maximum |