[enable counters] provide initial rates parameters (sonic-net#5048)

* [enable counters] provide initial rates parameters

Signed-off-by: Mykola Faryma <[email protected]>

* add descriptive comment

Signed-off-by: Mykola Faryma <[email protected]>

Co-authored-by: Volodymyr Samotiy <[email protected]>

Author: 2 people

dockers/docker-orchagent/enable_counters.py

@@ -1,16 +1,31 @@
 #!/usr/bin/env python3
 
 import time
-
 import swsssdk
 
+# ALPHA defines the size of the window over which we calculate the average value. ALPHA is 2/(N+1) where N is the interval(window size)
+# In this case we configure the window to be 10s. This way if we have a huge 1s spike in traffic, 
+# the average rate value will show a curve descending from the spike to the usual rate over approximately 10s.
+DEFAULT_SMOOTH_INTERVAL = '10'
+DEFAULT_ALPHA = '0.18'
+
 
 def enable_counter_group(db, name):
     info = {}
     info['FLEX_COUNTER_STATUS'] = 'enable'
     db.mod_entry("FLEX_COUNTER_TABLE", name, info)
 
 
+def enable_rates():
+    # set the default interval for rates 
+    counters_db = swsssdk.SonicV2Connector()
+    counters_db.connect('COUNTERS_DB')
+    counters_db.set('COUNTERS_DB', 'RATES:PORT', 'PORT_SMOOTH_INTERVAL', DEFAULT_SMOOTH_INTERVAL)
+    counters_db.set('COUNTERS_DB', 'RATES:PORT', 'PORT_ALPHA', DEFAULT_ALPHA)
+    counters_db.set('COUNTERS_DB', 'RATES:RIF', 'RIF_SMOOTH_INTERVAL', DEFAULT_SMOOTH_INTERVAL)
+    counters_db.set('COUNTERS_DB', 'RATES:RIF', 'RIF_ALPHA', DEFAULT_ALPHA)
+
+
 def enable_counters():
     db = swsssdk.ConfigDBConnector()
     db.connect()
@@ -22,6 +37,7 @@ def enable_counters():
     enable_counter_group(db, 'QUEUE_WATERMARK')
     enable_counter_group(db, 'BUFFER_POOL_WATERMARK')
     enable_counter_group(db, 'PORT_BUFFER_DROP')
+    enable_rates()
 
 
 def get_uptime():
@@ -43,3 +59,4 @@ def main():
 
 if __name__ == '__main__':
     main()
+