Use floats for moving average

Still using / 8 because / 32 gets pretty slow to increase
for low buffer sizes.

Author: lhoguin

deps/rabbit/src/rabbit_reader.erl

@@ -102,7 +102,7 @@
           proxy_socket,
           %% dynamic buffer
           dynamic_buffer_size = 128,
-          dynamic_buffer_moving_average = 0
+          dynamic_buffer_moving_average = 0.0
 }).
 
 -record(throttle, {
@@ -546,7 +546,7 @@ maybe_resize_buffer(State=#v1{sock=Sock, dynamic_buffer_size=BufferSize0,
     LowDynamicBuffer = 128,
     HighDynamicBuffer = 131072,
     DataLen = byte_size(Data),
-    MovingAvg = (MovingAvg0 * 7 + DataLen) div 8,
+    MovingAvg = (MovingAvg0 * 7 + DataLen) / 8,
     if
         BufferSize0 < HighDynamicBuffer andalso MovingAvg > BufferSize0 * 0.9 ->
             BufferSize = min(BufferSize0 * 2, HighDynamicBuffer),