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Microsoft launched Home windows 11 this week as a free replace from Home windows 10 for suitable PCs. Nevertheless, in case you are operating an AMD processor and haven’t up to date but, you could wish to maintain off as two efficiency bugs have recognized.
The primary one impacts the L3 cache and will increase latency by round 3x. Typical functions will see a 3-5% hit in efficiency, however esports video games can expertise as a lot as 10-15% slowdown.
The opposite bug prevents Home windows from utilizing AMD’s “most popular core” characteristic correctly. This characteristic is how the processor tells the OS which core can obtain the very best clockspeed (and would thus be best-suited for prime precedence duties). Software that run only some threads might be affected, however isn’t clear how a lot. AMD does say that the impact would be the most pronounced on processors with 8 cores or extra and TDP above 65W.
Identified Efficiency Modifications
Affect
Decision
Measured and useful L3 cache latency could improve by ~3X.
Functions delicate to reminiscence subsystem entry time could also be impacted. Anticipated efficiency influence of 3-5% in affected functions, 10-15% outliers doable in video games generally used for eSports.
A Home windows replace is in improvement to handle this challenge with anticipated availability in October of 2021.
UEFI CPPC2 (“most popular core”) could not preferentially schedule threads on a processor’s quickest core.
Functions delicate to the efficiency of 1 or a number of CPU threads could exhibit lowered efficiency. Efficiency influence could also be extra detectable in >8-core processors above 65W TDP.
A software program replace is in improvement to handle this challenge with anticipated availability in October of 2021.
AMD is working with Microsoft to resolve each points. The repair is anticipated to reach by the tip of the month, until there are bumps alongside the best way. So, relying on what sort of CPU you’ve got and what software program you run, you could wish to maintain off on updating to Home windows 11 till the repair rolls out.
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