powernow(4) - NetBSD Manual Pages

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POWERNOW(4)           NetBSD/x86 Kernel Interfaces Manual          POWERNOW(4)


NAME

     powernow -- AMD PowerNow! and Cool'n'Quiet


SYNOPSIS

     powernow0 at cpu0


DESCRIPTION

     The powernow driver supports AMD ``PowerNow!'' and ``Cool'n'Quiet'' CPU
     frequency scaling technologies.  The following sysctl(8) variables are
     available with powernow:

       machdep.cpu.frequency.target     The target frequency of the CPUs.

       machdep.cpu.frequency.current    The current frequency.

       machdep.cpu.frequency.available  The available frequencies.

     Note, however, that these variables are not guaranteed to exist in the
     future versions of NetBSD.


SEE ALSO

     acpicpu(4), x86/est(4), x86/odcm(4)


CAVEATS

     The powernow driver is considered a legacy interface to be used only with
     relatively old systems.  The driver supports only AMD processor families
     K7 (for instance, Duron, Athlon, and some Semprons) and K8 (namely, the
     early 64-bit family, including Athlon 64, Opteron, and Turion).

NetBSD 10.1                    September 7, 2020                   NetBSD 10.1