Set the energy performance preference for AMD.

ansible/roles/cpu/files/cpu_set_perf_perc_linux_amd

@@ -0,0 +1,21 @@
+#!/usr/bin/env bash
+#
+# Tell hardware p-states whether to maximize CPU performance (100) or
+# energy efficiency (0).
+set -euo pipefail
+IFS=$'\n\t'
+DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+
+perc=$1
+
+if [ "$perc" -ge 80 ]; then
+    echo "performance" | tee /sys/devices/system/cpu/cpufreq/policy*/energy_performance_preference
+elif [ "$perc" -ge 60 ]; then
+    echo "balance_performance" | tee /sys/devices/system/cpu/cpufreq/policy*/energy_performance_preference
+elif [ "$perc" -ge 40 ]; then
+    echo "default" | tee /sys/devices/system/cpu/cpufreq/policy*/energy_performance_preference
+elif [ "$perc" -ge 20 ]; then
+    echo "balance_power" | tee /sys/devices/system/cpu/cpufreq/policy*/energy_performance_preference
+else
+    echo "power" | tee /sys/devices/system/cpu/cpufreq/policy*/energy_performance_preference
+fi