For the record: this is the source:
https://github.com/netty/netty/blob/netty-3.6.5.Final/src/main/java/org/jboss/netty/handler/ssl/SslBufferPool.java#L38

However, a `git grep 16665` on the current Netty 4 master turns up empty. Maybe @normanmaurer has access to the latest Netty wisdom as to the required buffer size for preventing BUFFER_OVERFLOWs from the JDK SSLEngine?