NG-SD-Plugins/PowerTools
NG-SD-Plugins/PowerTools
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Update 'FAQ'

NGnius 2023-10-30 20:32:48 +00:00
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FAQ.md

@ -44,7 +44,7 @@ The SMT toggle in PowerTools doesn't technically disable SMT.
Instead it disables every second CPU, since every group of two CPUs is one logical CPU core.
## Why does disabling SMT speed up some games?
I don't really know. There is a bug before SteamOS 3.5 which caused cache issues when SMT was enabled, but there have been reports of some games still benefiting from SMT being disabled on SteamOS 3.5+ too.
I don't really know. There is a bug before SteamOS 3.5 which causes cache issues when SMT was enabled, but there have been reports of some games still benefiting from SMT being disabled on SteamOS 3.5+ too.
My theory, which is backed by exactly zero research and experiments, is that since SMT increases performance of a single core by less than 100% (usually it's closer to 30-50%), that 150% performance gets split between two threads, effectively reducing each thread's performance to 75% when both threads are under heavy load.
It would then follow that disabling one of those threads would restore the remaining thread to 100% performance.