Hot answers tagged memory
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 ...
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.
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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