Cheat Sheets

Performance - Powersave Off


On production hardware servers we do not want any type of power saving active. Checks both the CPU scaling governor /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor and if the Intel pstate driver is active with min_perf_pct at 100

Check Script:


# solution: For non-Intel: Install and configure cpufrequtils, For Intel: set /sys/devices/system/cpu/intel_pstate/min_perf_pct to 100

if grep -q powersave /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor 2>/dev/null; then if [ -f /sys/devices/system/cpu/intel_pstate/min_perf_pct ]; then min_perf_pct=$(cat /sys/devices/system/cpu/intel_pstate/min_perf_pct) if [ "$min_perf_pct" = 100 ]; then result_ok "Intel pstate is active and min_perf_pct=100" else result_warning "Intel pstate is active and min_perf_pct!=100 (is $min_perf_pct)" fi else result_failed "Some CPUs have powersave enabled!" fi else result_ok "Scaling governor != powersave" fi

result_inventory "cpufreq scaling_governor" $(cat /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor 2>/dev/null | sort | uniq) result_inventory "intel pstate" $(cd /sys/devices/system/cpu/intel_pstate/ 2>/dev/null && grep . * | sort | xargs)
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