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The EPYC 7451 NUMA config is weird in Linux, why?

Question asked by iamdady on May 16, 2018
Latest reply on May 23, 2018 by iamdady

Hi all,

   We have test a AMD EPYC 7451 server, and some thine weird comes up:

The topology of 7451 is created by lstopo Linux command in the attachment file, what's confusing me is why PU P40, PU P88, PU P2, PU P50 share a same L3 Cache(see bellow) but in two different NUMANode? Different NUMANode means different die, that's impossible for one L3 cache cross two die.

The L3 share information is obtained from bellow command:

$ cat cpu40/cache/index3/shared_cpu_list




Thanks a lot!