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From: Jonathan Gray (jsgcvs.openbsd.org)
Date: Mon Jul 05 2010 - 17:47:42 CDT
Module name: src
Changes by: jsgcvs.openbsd.org 2010/07/05 16:47:42
Rework somewhat for safety, so that we only interpret the values of
the PERF_STATUS MSR on earlier processors when we can't find the values
via acpi and have a bus clock value to use. And let processors we
don't set a bus clock on (ie nehalem) use speedstep again.
Expanded/changed version of a diff from gwk who isn't around right now.