AMD issues report on thread scheduling, gaming, Ryzen, and Windows 10

"AMD’s new Ryzen microprocessor has revitalized the company’s CPU business and makes a credible play for the workstation, desktop, and (soon) the server markets. Its gaming performance, however, was initially concerning. At 1080p, the company’s CPUs are well behind Intel, at least in certain titles.

Additional testing in our GTX 1080 Ti review showed that these losses don’t occur across the board, even at that resolution. There’s little gap between the 1800X and the 6900K at 1440p and effectively none at all at 4K. AMD has said itself that these losses may reflect the fact that Ryzen is so different from its own previous FX processors — but that didn’t explain why some users saw higher minimum frame rates in Windows 7 as compared with Windows 10. When we contacted AMD about these questions last week, the company told us it was investigating the problem, and some of the preliminary results from that investigation are now available.

In a recent blog post, AMD’s Robert Hallock shed some light on AMD’s research into this question and whether or not the Windows 10 scheduler is causing problems for AMD’s Ryzen microprocessor. From the post:"

We have investigated reports alleging incorrect thread scheduling on the AMD Ryzen™ processor. Based on our findings, AMD believes that the Windows® 10 thread scheduler is operating properly for “Zen,” and we do not presently believe there is an issue with the scheduler adversely utilizing the logical and physical configurations of the architecture.  [Emphasis added]

AMD’s blog post illustrates the importance of not rushing to judgment when a brand new CPU debuts and throws some odd performance results. Forum dogpiles can be attractive, but that doesn’t make they’re always right.

AMD issues report on thread scheduling, gaming, Ryzen, and Windows 10 - ExtremeTech