With ACPI timer gradually becoming one of slowest in the system, is there some reason to use it directly in acpi_cpu_idle()? I've made a patch:
to use binuptime() instead. Using even HPET from system time counter (not even speaking about TSC) that significantly improves performance on some workloads if this code is not covered by MWAIT optimization in cpu_idle().

Alexander Motin
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