A while back, it was reported that AMD processors suffer from multiple performance degradation issues in Windows 11. In addition to affecting the thread scheduling on some Ryzen processors (those with multiple active dies), the L3 cache latency (which is very important in gaming workloads) can also increase by as much as 3x, resulting in performance drops varying from 3-5% and even more in gaming. According to info received by WCCFTech, AMD will be issuing a fix for these bugs on Windows 11 next week.
– The CPPC issue has been resolved. The AMD driver power profile is in the release process and targeted for GA release on 10/21. If it is needed before GA, AMD can share the driver directly with customers upon request.
‒ The L3 cache latency issue has been resolved by Microsoft. Microsoft plans to release the fix in their 10C Windows Update which is targeted for 10/19.
The outlet claims that the L3 cache latency bug has been resolved by Microsoft, and the fix will come as part of an update on the 19th of October. This will be followed by a driver fix for the CPPC bug. The driver update has already been delivered to OEMs, with a general rollout expected on the 21st of October.
| Known Discrepancy | Impact | Fix |
|---|---|---|
| Measured and functional L3 cache latency may increase by ~3X. | Applications sensitive to memory subsystem access time may be impacted. Expected performance impact of 3-5% in affected applications, 10-15% outliers possible in games commonly used for eSports. | A Windows update is in development to address this issue with expected availability in October of 2021. |
| UEFI CPPC2 (“preferred core”) may not preferentially schedule threads on a processor’s fastest core. | Applications sensitive to the performance of one or a few CPU threads may exhibit reduced performance. Performance impact may be more detectable in >8-core processors above 65W TDP. | A software update is in development to address this issue with expected availability in October of 2021. |
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