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#!/bin/sh
# Only run this file on baremetal hosts.
if [ "$BOXCONF_VIRTUALIZATION_TYPE" != none ]; then
return
fi
# Allow lower C-states. As of FreeBSD 13, the default is to only allow C1.
# My Xeon processor supports C2, and enabling that resulted in 15 watts of
# power savings.
#
# Note that if your CPU supports *very* low C-states (likely for commodity
# desktop and laptop hardware), you may not want them enabled, as transitioning
# from a very low C-state can cause rather severe latency spikes.
#
# Experiment with your hardware and set $cx_lowest accordingly.
sysrc -v \
microcode_update_enable=YES \
performance_cx_lowest="$cx_lowest" \
economy_cx_lowest="$cx_lowest"
# Set energy/performance preference for Intel P-states.
# 0 = most performance, 100 = most power savings
if sysctl -n dev.hwpstate_intel.0.epp >/dev/null 2>&1; then
for n in $(seq 0 $(($(sysctl -n hw.ncpu)-1))); do
set_sysctl "dev.hwpstate_intel.${n}.epp=${intel_epp}"
done
fi
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