memory leak? a problem about DownstreamMessageEvent

[chris]

i'm developing a webgame,when i was doing performance testing(based on 8k
online user)  for one day(about 15 hours), 
i found  memory size jvm used was 4.8G ,i dump the memory by jmap,and
startup the jhat viewer,  the top 12 classes as follower:

307739 instances of class org.jboss.netty.channel.DownstreamMessageEvent 
297635 instances of class
org.jboss.netty.util.internal.LinkedTransferQueue$Node 
227420 instances of class org.jboss.netty.buffer.BigEndianHeapChannelBuffer 
159719 instances of class org.jboss.netty.channel.DefaultChannelFuture 
152708 instances of class
org.jboss.netty.channel.socket.nio.SocketSendBufferPool$PooledSendBuffer 
138592 instances of class
org.jboss.netty.channel.DefaultWriteCompletionEvent 
132096 instances of class org.jboss.netty.buffer.DuplicatedChannelBuffer 
120310 instances of class org.jboss.netty.buffer.DynamicChannelBuffer 
107109 instances of class org.jboss.netty.channel.UpstreamMessageEvent 
76816 instances of class
org.jboss.netty.util.internal.ConcurrentHashMap$Segment 
76816 instances of class
[Lorg.jboss.netty.util.internal.ConcurrentHashMap$HashEntry; 
65074 instances of class
org.jboss.netty.util.internal.ConcurrentHashMap$ValueIterator 

i can not get why the instance count of DownstreamMessageEvent and
UpstreamMessageEvent is so high?  can you  help me?  
thanks all.
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