We found the Missing Performance: Zen 5 Tested with SMT Disabled - eviltoast
  • conciselyverbose@sh.itjust.works
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    3 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.

    🤦‍♀️

    • adarza@lemmy.ca
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      3 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.

      • conciselyverbose@sh.itjust.works
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        3 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.

      • SomeoneSomewhere@lemmy.nz
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        3 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.

      • barsoap@lemm.ee
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        3 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.

        Or maybe Windows server has a proper scheduler and they never bothered bringing it to desktops?