Bug 1545308: Run packet instances with performance CPU governor

By default, the CPU governor is set to powersave, and the cores can run
in very low frequencies. Setting to performance makes the cores run at
their maximum frequencies.

deploy/template/lib/systemd/set-cpufreq

@@ -0,0 +1,51 @@
+#! /bin/sh
+# Set the CPU Frequency Scaling governor to "ondemand"/"powersave" where available
+set -eu
+
+FIRSTCPU=`cut -f1 -d- /sys/devices/system/cpu/online`
+AVAILABLE="/sys/devices/system/cpu/cpu$FIRSTCPU/cpufreq/scaling_available_governors"
+DOWN_FACTOR="/sys/devices/system/cpu/cpufreq/ondemand/sampling_down_factor"
+
+[ -f $AVAILABLE ] || exit 0
+
+read governors < $AVAILABLE
+case $governors in
+        *performance*)
+                GOVERNOR="performance"
+                break
+                ;;
+        *interactive*)
+                GOVERNOR="interactive"
+                break
+                ;;
+        *ondemand*)
+                GOVERNOR="ondemand"
+                case $(uname -m) in
+                        ppc64*)
+                                SAMPLING=100
+                        ;;
+                esac
+                break
+                ;;
+        *powersave*)
+                GOVERNOR="powersave"
+                break
+                ;;
+        *)
+                exit 0
+                ;;
+esac
+
+[ -n "${GOVERNOR:-}" ] || exit 0
+
+echo "Setting $GOVERNOR scheduler for all CPUs"
+
+for CPUFREQ in /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor
+do
+        [ -f $CPUFREQ ] || continue
+        echo -n $GOVERNOR > $CPUFREQ
+done
+if [ -n "${SAMPLING:-}" ] && [ -f $DOWN_FACTOR ]; then
+        echo -n $SAMPLING > $DOWN_FACTOR
+fi
+