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We found the Missing Performance: Zen 5 Tested with SMT Disabled
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this post was submitted on 10 Aug 2024
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so, basically, the os isn't tuned for the new chips yet.
the 2nd threads on smt-enabled cores are supposed to get hit last.
There should be no need for tuning, tweaking, or optimizing on functionality this basic.
If you ask the processor, it will spit out a graph like this telling you what threads/cores share resources, all the way up to (on large or server platforms) some RAM or PCIe slots being closer to certain groups of cores.