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4

No, a NUMA system is a NUMA system, there are nodes (generally CPUs), each node has it's own memory - most modern OS's will try to ensure that all memory allocations to a process are on the same node that the process is running. If this can't happen then yes you get the memory slowdown you've seen where a node is essentially acting like a memory controller ...


1

You are not wasting space. tmpfs has to be used before it will use RAM and paging space. free -h will show you memory use in human readable units. If you were using tmpfs space, that would be under shared.


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Depending on the number of your server's cores follow the table in this link For two processors (probably your case) you should place 6 DIMMs in A1 to A6 6 DIMMs in B1 to B6



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