AMD has investigated the issues of thread scheduling and according to them the Windows 10 thread scheduler is operating properly for Ryzen CPUs. According to the company there aren’t any issues related to the scheduler in the case of both the logical and the physical cores.


In a blog post, AMD's Robert Hallock, has mentioned new details on Ryzen. According to him there will no be a fix for low 1080p gaming performance on Windows 10. In other words you should not expect a Windows 10 performance patch. AMD tested Windows 10 and Windows 7 and thet don't believe that there is an issue that is related to scheduling. Furthermore Robert Hallock has posted a few more details on Ryzen covering the performance implications of SMT and Windows power management settings.

As reported by the company, the thread scheduling is operating properly on AMD Ryzen in the case of Windows 10. AMD has reviewed all the logs generated by the Sysinternals Coreinfo utility and they were able to determine that an outdated version of the application might report the incorrect topology data. Coreinfo v3.31 or later will show the correct results. Furthermore there should not be any performance difference between Windows 7 and Windows 10.

Right after the first reviews and leaks we have read several recommendations from AMD regarding which power plan is best to use in the case of Windows 10. Basically AMD suggest to use the "high performance" preset with AMD Ryzen. As stated by AMD there are two reasons: core parking and fast frequency changes. Core parking puts cores in idle as soon as they’re not needed. If there is a load again that requires the parked core to become active again, the core needs to be un-parked, which takes more time than it’s supposed to. On top of that fast frequency change is another feature you get with Ryzen, which is not working perfectly using the "balanced profile". In that case increasing or decreasing voltages takes longer than when you have the "high performance” profile activated. AMD therefore reports that the "balanced profile" is way too aggressive and adds extra latency, which has an impact to the performance of the CPU.

Last but not least AMD investigated SMT performance as well. Based on their findings there are several games like Battlefield 1, Armar 3 or For Honor that have a neutral/positive benefit from SMT. Regarding the remaining titles, AMD will improve the codebase and fix the issues.




Source: AMD