Bug 1327341

Summary: NR_CPUs only 64 CPUs
Product: [Fedora] Fedora Reporter: Andi Kleen <andi.kleen>
Component: kernelAssignee: Kernel Maintainer List <kernel-maint>
Status: CLOSED NOTABUG QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 23CC: gansalmon, itamar, jamorgan, jonathan, kernel-maint, labbott, madhu.chinakonda, mchehab
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Hardware: Unspecified   
OS: Unspecified   
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Fixed In Version: Doc Type: Bug Fix
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Last Closed: 2016-04-14 22:06:29 UTC Type: Bug
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description Andi Kleen 2016-04-14 20:26:34 UTC 
Description of problem:

NR_CPUS is only 64 CPUs which is far too small for many servers.


Version-Release number of selected component (if applicable):

 4.3.5-300.fc23.x86_64 #1 SMP Mon Feb 1 03:18:41 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux



How reproducible:



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Expected results:


Additional info:
Comment 1 Laura Abbott 2016-04-14 20:37:47 UTC 
Can you share bootup logs or whatever you are seeing that is showing only 64 CPUs? The sources should be setting NR_CPUs to 1024 on x86_64
Comment 2 Josh Boyer 2016-04-14 20:44:45 UTC 
(In reply to Andi Kleen from comment #0)
> Description of problem:
> 
> NR_CPUS is only 64 CPUs which is far too small for many servers.
> 
> 
> Version-Release number of selected component (if applicable):
> 
>  4.3.5-300.fc23.x86_64 #1 SMP Mon Feb 1 03:18:41 UTC 2016 x86_64 x86_64
> x86_64 GNU/Linux

That is extremely strange.  If you look at the corresponding config file in /boot, it should indeed be 1024 as Laura said.  So I don't think it's a CONFIG_NR_CPUS problem that you're seeing.
Comment 3 Andi Kleen 2016-04-14 22:06:29 UTC 
Never mind. It turned out the system actually only had 64 CPUs, so no bug. Sorry for the noise.