On October 12, Microsoft released the first cumulative updates for the new operating system, Windows 11, since its release on October 5. The monthly update packages for the operating system are called Update Tuesdays. It is scheduled to be released on the second Tuesday of every month.
Shortly after the release of Windows 11, AMD and Microsoft together discovered that Windows 11 was not well optimized for AMD Ryzen processors, which experience significant L3 cache latency, and do not run UEFI-CPPC2 (the preferred core mechanism).
According to reports, TechPowerUp has tested the Ryzen 7 2700X Pinnacle Ridge processor, which typically delivers an L3 cache response time of 10ns.
The test showed that the L3 cache response time was 17 nanoseconds. This got even worse with the October 12 update, increasing the latency to 31.9 nanoseconds.
This represents a threefold increase in L3 cache latency. This slows performance by up to 15 percent in some games.
AMD issued a statement via social media. The company stated that the patches for the two issues were developed, and the dates on which they would be issued were determined.
The Preferred Cores (UEFI-CPPC2) error patch will be released on October 21. Customers can request correction sooner. AMD may refer to large enterprise customers running mission-critical applications via Threadripper or EPYC-powered workstations.
The L3 cache response time bug is being fixed through the Windows Update channel, and is scheduled for release on October 19.
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AMD processors experience much higher response time
If the rumors surrounding the release dates of the 12th generation Intel Alder Lake processors in late October and early November are true, then the situation with these patches has a direct bearing on AMD.
It’s surprising to see Windows 11 come with these issues, especially when Microsoft limited the amount of supported processors for this new operating system.
Bugs always occur with new OS versions. But such an obvious effect on processor performance had to be identified during months of public beta testing.
Read also: AMD warns against the performance of its processors through Windows 11
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