MSR_IA32_MPERF    283 arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c 	rdmsr(MSR_IA32_MPERF, mperf_cur.split.lo, mperf_cur.split.hi);
MSR_IA32_MPERF    286 arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.c 	wrmsr(MSR_IA32_MPERF, 0,0);