From SME Server
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Your MacMini supports multiple cpu frequencies. Using multiple frequencies can even reduce power consumption but without reducing your cpu power. The used frequence depends on the demanded processes.
If you give the command
# cat /proc/cpuinfo
# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver
You can see th possible cpu frequencies with the command
# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_availaible_frequencies
# 1833000 1667000 1500000 1333000 1000000
Using multiple cpu frequencies, you have to config your system as follows:
Edit the file /etc/cpuspeed.conf and uncomment the line with the driver
# append="apm=off acpi=on"
Last but not least config the servive db so that the cpuspeed service starts when booting your MacMini:
# signal-event post-upgrade
# signal-event reboot
From now on your MacMini should use successful the cpuspeed service to swich between multiple cpu frequencies.
Have much fun with the energy efficient MacMini as your preferred SME home server platform !