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Linux Opteron system appears to be UMA but should be NUMA

According to numactl, this dual CPU Opteron box is UMA rather than the expected NUMA: $ numactl --hardware available: 1 nodes (0) node 0 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 node 0 size: 65534 ...
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guide for max memory bandwidth AMD Opteron 61xx series

the new opteron have 4 mem channels per CPU. general guidelines for Intel Nehalem: one DIMM in each mem channel results in 1333 Mhz more than 1 DIMM in each channel = 1066Mhz more than 2 per ...