* started reducing the temporary buffers created within various crypto methods , as we've

got some pretty heavy GC churn when under load.  rough estimate is we allocate 5-8x as
much data as we need, copying it all over the place before forwarding it (or processing it).
this should cut down a few of those copies, but not enough yet.  it'd be great to get that
down to 2x.
* lots of logging

router/java/src/net/i2p/data/i2np/TunnelMessage.java

@@ -89,7 +89,7 @@ public class TunnelMessage extends I2NPMessageImpl {
         if ( (_tunnelId == null) || (_data == null) || (_data.length <= 0) )
             throw new I2NPMessageException("Not enough data to write out");
         
-        ByteArrayOutputStream os = new ByteArrayOutputStream(4096);
+        ByteArrayOutputStream os = new ByteArrayOutputStream(64+_data.length);
         try {
             _tunnelId.writeBytes(os);
             if (_log.shouldLog(Log.DEBUG))