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Much lower memory bandwidth with NUMA disabled

111alan
Novice
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Since some applications could not effectively utilize more than one NUMA node, I'm testing the situation when NUMA was disabled with a 2S cascade-lake-sp system(48 cores, 12channels total). 

The memory latency impact was expected, but the bandwidth was also severely lowered to about 73GB/s, that is 1/3 of the same system with NUMA enabled, or almost half that of a 1S 6-channel system.

Why disabling NUMA has such huge effect on memory bandwidth, even more than on latency? Are there anything I can do to improve on this?

Thanks.

8259CLx2_mlc.JPG

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111alan
Novice
587 Views

Thx, another small question, what is the CPUID for Cooperlake-SP Xeon? 

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