TNonblockingServer performance

[Rush Manbert]

Has anyone else built the non-blocking version of the C++ stress-test?  
When I run it with a client count of 20 and a loop count of 100 I see  
a rate value of about 395.

With the blocking version and the same parameters I see a rate between  
28000 and 34000, depending on the server type.

The TNonblockingServer header says this is a server for high  
performance, but that's not what I'm seeing. I'm on Mac OS X 10.5.6.

Is there anyone else who is getting different results?

- Rush