On Tue, 9 Sep 2025 14:42:54 +0200 Marc Gonzalez <marc.w.gonzalez@xxxxxxx> wrote: > > ...there is no SMI running on this CPU, and no power management running > > (also in the BIOS settings) > > Actually, I'm 99.9% sure that clock source accuracy & SMM are red herrings. You may want to run the osnoise or hwlat tracer to see if SMM or anything else the kernel does could cause issues with your tests. -- Steve