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* [PATCH] x86: Allow NR_CPUS=1024
@ 2013-11-01 14:11 Josh Boyer
  2013-11-03 10:18 ` Ingo Molnar
  2013-11-05 14:37 ` [PATCH 1/2 v2] x86: Allow higher NR_CPUS values Josh Boyer
  0 siblings, 2 replies; 33+ messages in thread
From: Josh Boyer @ 2013-11-01 14:11 UTC (permalink / raw)
  To: Thomas Gleixner, Ingo Molnar, H. Peter Anvin; +Cc: prarit, x86, linux-kernel

The current range for SMP configs is 2 - 512, or a full 4096 in the case of
MAXSMP.  There are machines that have 1024 CPUs in them today and configuring
a kernel for that means you are forced to set MAXSMP.  This adds additional
unnecessary overhead.  While that overhead might be considered tiny for large
machines, it isn't necessarily so if you are building a kernel that runs
across a wide variety of machines.  We increase the range to 1024 to help
with this.

Signed-off-by: Josh Boyer <jwboyer@fedoraproject.org>
---
 arch/x86/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index f67e839..d726b2d 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -825,7 +825,7 @@ config MAXSMP
 config NR_CPUS
 	int "Maximum number of CPUs" if SMP && !MAXSMP
 	range 2 8 if SMP && X86_32 && !X86_BIGSMP
-	range 2 512 if SMP && !MAXSMP
+	range 2 1024 if SMP && !MAXSMP
 	default "1" if !SMP
 	default "4096" if MAXSMP
 	default "32" if SMP && (X86_NUMAQ || X86_SUMMIT || X86_BIGSMP || X86_ES7000)
-- 
1.8.3.1


^ permalink raw reply related	[flat|nested] 33+ messages in thread

end of thread, other threads:[~2013-11-07 13:51 UTC | newest]

Thread overview: 33+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2013-11-01 14:11 [PATCH] x86: Allow NR_CPUS=1024 Josh Boyer
2013-11-03 10:18 ` Ingo Molnar
2013-11-03 10:21   ` Ingo Molnar
2013-11-03 15:57     ` Josh Boyer
2013-11-03 17:43       ` H. Peter Anvin
2013-11-04  6:51         ` Ingo Molnar
2013-11-04 16:31           ` H. Peter Anvin
2013-11-04  6:53       ` Ingo Molnar
2013-11-04 14:01         ` Josh Boyer
2013-11-04 14:10           ` Ingo Molnar
2013-11-04 14:16             ` Josh Boyer
2013-11-04 14:54               ` Prarit Bhargava
2013-11-04 15:56               ` Russ Anderson
2013-11-04 17:48                 ` Ingo Molnar
2013-11-04 19:08                   ` H. Peter Anvin
2013-11-04 20:11                     ` Ingo Molnar
2013-11-04 22:50                       ` H. Peter Anvin
2013-11-05  6:25                         ` Ingo Molnar
2013-11-05  6:31                           ` Li Zefan
2013-11-03 14:29   ` Prarit Bhargava
2013-11-03 14:42     ` Russ Anderson
2013-11-05 14:37 ` [PATCH 1/2 v2] x86: Allow higher NR_CPUS values Josh Boyer
2013-11-05 14:38   ` [PATCH 2/2] x86: Increase MAXSMP CPU count to 8192 Josh Boyer
2013-11-06  5:56     ` [PATCH v2 " Ingo Molnar
2013-11-06 14:10       ` Josh Boyer
2013-11-06 11:20     ` [tip:x86/cpu] x86/cpu: Increase max " tip-bot for Josh Boyer
2013-11-06  7:15   ` [PATCH 1/2 v2] x86: Allow higher NR_CPUS values Ingo Molnar
2013-11-06 14:12     ` Josh Boyer
2013-11-06 15:04       ` Josh Boyer
2013-11-06 15:21     ` [PATCH v3] x86/cpu: " Josh Boyer
2013-11-07  9:15       ` Ingo Molnar
2013-11-07 13:51         ` Josh Boyer
2013-11-06 11:20   ` [tip:x86/cpu] " tip-bot for Josh Boyer

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