Two days after the release of Windows 11, AMD confirmed two platform-related bugs that affected the performance of PCs with Ryzen processors. The problems were related to the L3 cache and the preferred core mechanism, affecting single-core performance. Now, both the company responsible for the chips and Microsoft have released fixes for the flaws.
As AMD reported on October 7, Windows 11 was causing a latency of the L3 cache at approximately 3x. The company said that any application sensitive to memory subsystem access time could be affected, however, the effects of this bug would be stronger for eSports games, with a drop of between 10% and 15%.
The failure even worsened with the October Patch Tuesday, bringing latency from 17 ns to up to 31.9 ns.
The problem with the preferred core mechanism prevented AMD processors from identifying the best core for tasks, including the most demanding ones. In this case, it only distributed the processes randomly, which tended to degrade performance in single-core, or in tasks that use only a few cores.
AMD has released a driver for chipsets that should fix the flaw in the preferred core technology, it can be found on this page.
Last week, Microsoft released a fix for the L3 cache issue for Insiders, and now it is available for the stable version of the system under the name KB5006746. You manually download it here or wait until the November Patch Tuesday, in which it will also be present.
