title: Usage of Netty WRITE_SPIN_COUNT
body: <p>I would like to understand the usage of Netty's Channel Option "WRITE_SPIN_COUNT".
  What is the effect of setting this value higher or lower than the default( 16 ). Should this be set at all.? 
  This is what i got from the Netty documentation but wasn't clear why and when should we set this value : <a href="http://netty.io/4.0/api/io/netty/channel/DefaultChannelConfig.html#getWriteSpinCount()" rel="nofollow">http://netty.io/4.0/api/io/netty/channel/DefaultChannelConfig.html#getWriteSpinCount()</a>
  As per the documentation it says : 
  Returns the maximum loop count for a write operation until WritableByteChannel.write(ByteBuffer) returns a non-zero value. It is similar to what a spin lock is used for in concurrency programming. It improves memory utilization and write throughput depending on the platform that JVM runs on. The default value is 16.</p>