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I can disable CPU boost with both kernel versions. Thanks for checking those. That's good to hear it's only an issue in the LTS series. It means we have the option to either drop that patch from LTS kernel series or identify the other commit(s) that helped it. Can you see if adding this commit to 6.6.y helps you? https://git.kernel.org/superm1/c/8164f743326404fbe00a721a12efd86b2a8d74d2 > >> I'd like to understand if we just have a missing commit to backport >> or it's a problem in the mainline kernel as well. >> >> From the below description it's specifically with boost in passive >> mode, right? > > I have only tested the passive mode on all my Ryzen systems and only my > Zen4 machine shows this regression. > That's an interesting finding. Do you know if your other system(s) support preferred cores? Also as a curiosity why don't you use active mode (EPP)? Most people find a better balance with perf/efficiency with EPP.