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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: Steps to Reproduce: 1. 2. 3. Actual results: Expected results: Additional info:
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
(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.
Never mind. It turned out the system actually only had 64 CPUs, so no bug. Sorry for the noise.