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gPeCHnQDSPltxFXal8DQKYpj9b6BU0eJOtGDuKeoJCHAhakkeaCyEBklOmQWjUrciPenqbinapN QTF4WJlwM79mQ/Iy94uJ1Ff62si6vQwGEsmPACPZveYpsy+qCuxzMZJRquTGa+8cPQ4IqeqPikQ uXoro0CBAdFKz9/GCiZaCis6EsUXwkKAz4gg5beaDy5RcbL4Nc4= Hi Chris, During testing, we are seeing a ~6% performance regression with the upstream stable v6.12.43 kernel (And Oracle UEK 6.12.0-104.43.4.el9uek.x86_64 kernel) when running the Phoronix pts/apache benchmark with 100 concurrent requests [0].  The regression is seen with the following hardware: PROCESSOR: Intel Xeon Platinum 8167M Core Count: 8 Thread Count: 16 Extensions: SSE 4.2 + AVX512CD + AVX2 + AVX + RDRAND + FSGSBASE Cache Size: 16 MB Microcode: 0x1 Core Family: Cascade Lake After performing a bisect, we found that the performance regression was introduced by the following commit: Stable v6.12.43: fc4289233e4b ("sched/fair: Bump sd->max_newidle_lb_cost when newidle balance fails") Mainline v6.17-rc1: 155213a2aed4 ("sched/fair: Bump sd->max_newidle_lb_cost when newidle balance fails") Reverting this commit causes the performance regression to not exist. I was hoping to get your feedback, since you are the patch author.  Do you think gathering any additional data will help diagnose this issue? Thanks, Joe [0]https://openbenchmarking.org/test/pts/apache-3.0.0