NIO one-to-one connection read threads?

[sirsoren]

I have come across a problem that puzzles me. 

I connect 100 clients to a Netty/Nio based server doing trivial work.

Running locally on my Windows box the result is never more than 8 active IO
threads throughout the test.

On our Sparc server running Solaris 10 and Java 1.6.0_17 this results in 100
IO threads being spawn on the server side, one per connection. All threads
in the pool are active during the whole test. 

If I was using Oio sockets then I would expect the second scenario, but
since I am using Nio I would expect the number of IO thread to be limited as
when I run the server locally.

Has anybody seen similar behavior on Sparc/Solaris? 

(Small note: I am executing from within a zone, so maybe virtualization is a
player).

/Søren

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