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This topic has been translated from a Chinese forum by GPT and might contain errors.Original topic: NUMA node是由什么决定的？是系统层的配置吗？
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username: jaybing926
What determines the number of NUMA nodes? Is it a system-level configuration? Why do I have 2 nodes on some systems and 4 nodes on others with the same hardware configuration? I want to change from 4 nodes to 2 nodes, how can I do that? Can someone explain this, please? Thanks ~~~
If I hadn’t recovered, I would have really believed it~~~
Answer: It was a BIOS setting issue. For the 4-node setup, I restored the BIOS to its default settings and it became 2 nodes. I don’t understand the specific principle behind it.
@h5n1 is right, how did you change it? Even with overclocking, it shouldn’t be possible.
The consequence of making random changes is that it may cause some strange performance issues.
I don’t know what was changed. This machine had issues before, and a lot of things were debugged. It was adjusted by the data center personnel, so I don’t know the specifics either.
The conclusion is: Restoring the BIOS to default settings fixed it. At least, that’s how it appears~~ Haha
The hardware architecture is determined at the factory, right? I’m curious, after restoring the default configuration, did you check if the total amount of CPU and memory corresponding to each node is correct?
Previously, I also understood it this way. I originally thought that 2 physical CPUs would result in 2 nodes. But this time, I think I was wrong~~
It looks like it’s combined. I have sought examples in this area before, and finally, I see someone doing it this way. Which vendor’s machine are you using? What motherboard? Is it an ARM architecture?
This is AMD.
Other ARM architectures and Intel architectures need specific analysis.
DELL R450 model 4310CPU *2
I always understood that the number of nodes was determined by the number of physical CPUs. This has completely overturned my understanding. Now I totally don’t get it. Can someone explain it to me? 
Amazing, it’s the first time I’ve seen it done this way. Isn’t this thing determined at the factory?
Search and see if there is a hyper-threading setting in your BIOS. Try adjusting it, or post a screenshot of the CPU settings in your BIOS.
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