Wednesday, October 6th 2021
AMD Processors Lose 15% Gaming Performance with Windows 11, L3 Cache Latency Tripled
Apparently, AMD processors officially compatible with Windows 11, exhibit a three-times increase in L3 cache latency with the new operating system. The new operating system is also found to break the "preferred cores" system on AMD processors (UEFI CPPC2), in which the two "best" CPU cores, which can sustain the highest boost frequencies, are highlighted to the operating system, so most of the light-threaded traffic could be sent to them.
AMD and Microsoft jointly made this discovery, and listed out potential impact on application performance. The increased L3 cache latency affects performance of applications sensitive to memory performance. They also warn of a 10-15% loss in gaming performance. On the other hand, a dysfunctional "preferred cores" system would mean reduced performance in light-threaded tasks as the OS is unaware which are the processor's two best cores. Thankfully, both issues can be fixed via software updates, and AMD is working with Microsoft to push fixes for both issues through Windows Update, in an update rollout scheduled within October 2021.
Source:
AMD
AMD and Microsoft jointly made this discovery, and listed out potential impact on application performance. The increased L3 cache latency affects performance of applications sensitive to memory performance. They also warn of a 10-15% loss in gaming performance. On the other hand, a dysfunctional "preferred cores" system would mean reduced performance in light-threaded tasks as the OS is unaware which are the processor's two best cores. Thankfully, both issues can be fixed via software updates, and AMD is working with Microsoft to push fixes for both issues through Windows Update, in an update rollout scheduled within October 2021.
141 Comments on AMD Processors Lose 15% Gaming Performance with Windows 11, L3 Cache Latency Tripled
Take these ones as an example of where you should be (maybe a little better than mine, but around that range) once Microsoft pushes the fix (hopefully next week):
Almost as if...
Where did you your fake news? All processor are affected but not ridiculous numbers..... 3% for AMD and 4% for Intel.
Core 7 is supposed to be assigned background tasks only. Windows 11 is literally running an entire game exclusively on Core 7 as we speak:
I don't like conspiracy theories usually, but this is such a ridiculous regression from the Windows scheduler and CPPC2 having worked just fine together for months.