Windows 11 cumulative update worsens AMD processor performance issues

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AMD Ryzen 9 3900XSource: Rich Edmonds / Windows Central

Shortly after the launch of Windows 11, two issues were discovered that affected the performance of AMD processors. One problem caused a performance drop of 10-15%. Those issues got even worse following the first cumulative update to Windows 11, according to a report by TechPowerUp. People with affected AMD systems may want to wait to upgrade to Windows 11 as fixes for these issues are expected later this month.

One of the previously discovered issues can cause L3 cache latency to increase dramatically. The other issue involves AMD’s preferred core technology, which shifts threads to the fastest core on a processor. TechPowerUp’s findings relate to the first issue.

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“In our own testing, a Ryzen 7 2700X “Pinnacle Ridge” processor, which typically posts an L3 cache latency of 10 ns, was tested to show a latency of 17 ns,” said TechPowerUp. “This was made much worse with the October 12 “patch Tuesday” update, driving up the latency to 31.9 ns.”

AMD reportedly shared a statement on social media, which has since appeared on Reddit, about fixes for these issues. A patch for the preferred core bug will come in an AMD driver update on October 21, 2021, according to the post. A Windows Update said to be on the way for October 19, 2021 will address the L3 cache latency issue.

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