ZLT: Fix bug when no input value is possible

npf/expdesign/zltexp.py

@@ -84,6 +84,8 @@ def __next__(self):
         # get all outputs for all inputs
         vals_for_current = {}
         acceptable_rates = []
+
+        # max_r is the maximal rate (tried or not) that we tried but still dropped some packets
         max_r = max(self.executable_values)
         for r, vals in self.results.items():
             if Run(self.current).inside(r):
@@ -115,7 +117,12 @@ def __next__(self):
 
             #Step 2 : go for the rate below the output of the max input
             maybe_achievable_inputs = list(filter(lambda x : x <= max_r, self.executable_values))
-            next_val = max(maybe_achievable_inputs)
+            if len(maybe_achievable_inputs) == 0:
+                print(f"WARNING: No achievable for {self.input}! Tried {max_r} and it did not work.")
+                self.current = None
+                return self.__next__()
+            else:
+                next_val = max(maybe_achievable_inputs)
         else:
 
             maybe_achievable_inputs = list(filter(lambda x : x <= max_r*self.margin, self.executable_values))