COB-121: Reverse performance metric for tSubbandProcPerformance

RTCP/Cobalt/GPUProc/test/SubbandProcs/tSubbandProcPerformance_compare.py

@@ -79,9 +79,9 @@ for name, runtime_reference in measurements_reference.items():
         runtime_candidate = measurements_candidate[name]
 
         # Compare the two measurements
-        performance = runtime_reference / runtime_candidate * 100
+        performance = runtime_candidate / runtime_reference * 100
         result = "\"{}\", reference: {:.2f}, candidate: {:.2f} ({:.1f} %)".format(name, runtime_reference, runtime_candidate, performance)
-        if (performance > (100 - tolerance)):
+        if (performance < (100 + tolerance)):
             passed.append(result)
         else:
             failed.append(result)