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We found the Missing Performance: Zen 5 Tested with SMT Disabled (www.techpowerup.com)

submitted 3 months ago by floofloof@lemmy.ca to c/technology@lemmy.world

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[–] conciselyverbose@sh.itjust.works 71 points 3 months ago (8 children)

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 31 points 3 months ago (6 children)

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.

[–] barsoap@lemm.ee 3 points 3 months ago* (last edited 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?

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