We found the Missing Performance: Zen 5 Tested with SMT Disabled

Comments

• conciselyverbose@sh.itjust.works ⁨2⁩ ⁨months⁩ ago

  During the course of our testing, we observed that Windows 11 was scheduling workloads on the 9700X in a manner that would try to saturate a single core first, by placing workloads on each of its logical threads.

  🤦‍♀️

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  • adarza@lemmy.ca ⁨2⁩ ⁨months⁩ ago

    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.

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    • conciselyverbose@sh.itjust.works ⁨2⁩ ⁨months⁩ ago

      It’s an easy fix, sure.

      But there are 3 manufacturers for them to schedule for. It should be ready way before anything ships.

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    • SomeoneSomewhere@lemmy.nz ⁨2⁩ ⁨months⁩ ago

      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.

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    • barsoap@lemm.ee ⁨2⁩ ⁨months⁩ ago

      For values of “new chips” that include 20 year old ones. Foster was released 2001, the chips were single-core but you could have up to eight on a board so it’s still multi-core SMT. First on-die multi-core SMT seemed to have been Paxville, 2005.

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• JRepin@lemmy.ml ⁨2⁩ ⁨months⁩ ago

  Or they just found out that Windows process scheduler is still broken beyond repair. If you look at the benchmarks on GNU/Linux performance is all there. For example see Phoronix benchmark

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• drbluefall@toast.ooo ⁨2⁩ ⁨months⁩ ago

  I know the article says what it is, I know it’s wrong, I know it’s irrelevant…

  But I can’t read “SMT” as anything other as Shin Megami Tensei.

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