diff --git a/etc/collector.yml b/etc/collector.yml
index 8ba85351..6746f9e5 100644
--- a/etc/collector.yml
+++ b/etc/collector.yml
@@ -16,7 +16,7 @@ sys:
   mountPoint: []
   mountIgnorePrefix:
     - /var/lib
- 
+
   ignoreMetrics:
     - cpu.core.idle
     - cpu.core.util
diff --git a/src/modules/collector/cache/cache.go b/src/modules/collector/cache/cache.go
index 86e2046d..642dd0a3 100644
--- a/src/modules/collector/cache/cache.go
+++ b/src/modules/collector/cache/cache.go
@@ -56,7 +56,7 @@ func (h *History) clean() {
 	defer h.Unlock()
 	now := time.Now().Unix()
 	for key, item := range h.Data {
-		if now-item.Timestamp > 2*item.Step {
+		if now-item.Timestamp > 10*item.Step {
 			delete(h.Data, key)
 		}
 	}
diff --git a/src/modules/collector/sys/funcs/push.go b/src/modules/collector/sys/funcs/push.go
index 743da28b..a22ba72b 100644
--- a/src/modules/collector/sys/funcs/push.go
+++ b/src/modules/collector/sys/funcs/push.go
@@ -96,17 +96,23 @@ func Push(metricItems []*dataobj.MetricValue) error {
 
 func CounterToGauge(item *dataobj.MetricValue) error {
 	key := item.PK()
+
 	old, exists := cache.MetricHistory.Get(key)
+	cache.MetricHistory.Set(key, *item)
+
 	if !exists {
-		cache.MetricHistory.Set(key, *item)
 		return fmt.Errorf("not found old item:%v", item)
 	}
 
-	cache.MetricHistory.Set(key, *item)
 	if old.Value > item.Value {
 		return fmt.Errorf("item:%v old value:%v greater than new value:%v", item, old.Value, item.Value)
 	}
-	item.ValueUntyped = item.Value - old.Value
+
+	if old.Timestamp > item.Timestamp {
+		return fmt.Errorf("item:%v old timestamp:%v greater than new timestamp:%v", item, old.Timestamp, item.Timestamp)
+	}
+
+	item.ValueUntyped = (item.Value - old.Value) / float64(item.Timestamp-old.Timestamp)
 	item.CounterType = dataobj.GAUGE
 	return nil
 }