diff --git a/lib/cpu.js b/lib/cpu.js
index 0a4522f..db424c7 100644
--- a/lib/cpu.js
+++ b/lib/cpu.js
@@ -606,6 +606,8 @@ function getCpu() {
         governor: '',
         cores: util.cores(),
         physicalCores: util.cores(),
+        performanceCores: util.cores(),
+        efficiencyCores: 0,
         processors: 1,
         socket: '',
         flags: '',
@@ -717,8 +719,8 @@ function getCpu() {
             const cpus = (parseInt(util.getValue(lines, 'cpu(s)'), 10) || 1);
             const coresPerSocket = parseInt(util.getValue(lines, 'core(s) per socket'), 10);
             result.physicalCores = coresPerSocket ? coresPerSocket * processorsInt : result.cores / threadsPerCoreInt;
-            // result.performanceCores = threadsPerCoreInt > 1 ? result.cores - result.physicalCores : result.cores;
-            // result.efficientCores = threadsPerCoreInt > 1 ? result.cores - (threadsPerCoreInt * result.performanceCores) : 0;
+            result.performanceCores = threadsPerCoreInt > 1 ? result.cores - result.physicalCores : result.cores;
+            result.efficiencyCores = threadsPerCoreInt > 1 ? result.cores - (threadsPerCoreInt * result.performanceCores) : 0;
             result.processors = processorsInt;
             result.governor = util.getValue(lines, 'governor') || '';