X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=resources%2Flibraries%2Fpython%2FNATUtil.py;h=aabcd36cdae92457bf2f5d52096c0b25a0dad426;hb=2c0affb70d06918e6ba0c9409d4cb7afc39b603a;hp=857870393e648bdefa1410632f2ce1a993c6a1d2;hpb=44e560e51b41b5af5931be3ffa027411269c288d;p=csit.git

diff --git a/resources/libraries/python/NATUtil.py b/resources/libraries/python/NATUtil.py
index 857870393e..aabcd36cda 100644
--- a/resources/libraries/python/NATUtil.py
+++ b/resources/libraries/python/NATUtil.py
@@ -185,6 +185,22 @@ class NATUtil:
         ]
         PapiSocketExecutor.dump_and_log(node, cmds)
 
+    @staticmethod
+    def compute_max_translations_per_thread(sessions, threads):
+        """Compute value of max_translations_per_thread NAT44 parameter based on
+        total number of worker threads.
+
+        :param sessions: Required number of NAT44 sessions.
+        :param threads: Number of worker threads.
+        :type sessions: int
+        :type threads: int
+        :returns: Value of max_translations_per_thread NAT44 parameter.
+        :rtype: int
+        """
+        from math import log2, modf
+        rest, mult = modf(log2(sessions/(10*threads)))
+        return 2 ** (int(mult) + (1 if rest else 0)) * 10
+
     # DET44 PAPI calls
     # DET44 means deterministic mode of NAT44
     @staticmethod