diff --git a/ceilometer_zvm/compute/virt/zvm/inspector.py b/ceilometer_zvm/compute/virt/zvm/inspector.py
index 09e6180..0d6c475 100644
--- a/ceilometer_zvm/compute/virt/zvm/inspector.py
+++ b/ceilometer_zvm/compute/virt/zvm/inspector.py
@@ -21,8 +21,8 @@ from ceilometer.i18n import _
 from ceilometer_zvm.compute.virt.zvm import exception
 from ceilometer_zvm.compute.virt.zvm import utils as zvmutils
 from oslo_config import cfg
-from oslo_utils import units
 from oslo_log import log
+from oslo_utils import units
 
 LOG = log.getLogger(__name__)
 
@@ -86,45 +86,13 @@ class ZVMInspector(virt_inspector.Inspector):
         LOG.debug("instance stats:%s", str(inst_stats))
         cpu_number = inst_stats['guest_cpus']
         used_cpu_time = (inst_stats['used_cpu_time_us'] * units.k)
-        cpu_util = self._calc_cpu_util(instance, inst_stats)
         used_mem_mb = inst_stats['used_mem_kb'] / units.Ki
         # Construct the final result
         return virt_inspector.InstanceStats(cpu_number=cpu_number,
                                             cpu_time=used_cpu_time,
-                                            memory_usage=used_mem_mb,
-                                            cpu_util=cpu_util
+                                            memory_usage=used_mem_mb
                                             )
 
-    def _save_inst_data(self, instance, inst_stats):
-        inst_name = zvmutils.get_inst_name(instance).upper()
-        data = inst_stats
-        data['time_stamp'] = time.time()
-        self.cache[inst_name] = data
-
-    def _load_inst_data(self, instance):
-        inst_name = zvmutils.get_inst_name(instance).upper()
-        try:
-            return self.cache[inst_name]
-        except KeyError:
-            LOG.info('no cache for instance %s', inst_name)
-            return None
-
-    def _calc_cpu_util(self, instance, inst_stats):
-        previous_stats = self._load_inst_data(instance)
-        if previous_stats:
-            current_time = time.time()
-            previous_time = previous_stats['time_stamp']
-            cpu_util = (inst_stats['used_cpu_time_us']/inst_stats['guest_cpus'] - \
-                previous_stats['used_cpu_time_us']/previous_stats['guest_cpus']) / \
-                ((current_time-previous_time)*units.k)
-            self._save_inst_data(instance, inst_stats)
-            return cpu_util
-        else:
-            cpu_util = inst_stats['used_cpu_time_us']/ \
-                inst_stats['elapsed_cpu_time_us']
-            self._save_inst_data(instance, inst_stats)
-            return cpu_util
-
     def _inspect_inst_data(self, instance, inspect_type):
         inspect_data = {}
         # Make sure the inst name in upper case