Zmq stalls under high load

Under high load of req/rep connecting and disconnecting, zmq seems to stall inside it's event loop.

The test case is a client with one threads that does :

• connect to the server ;

• send a number ;

• read response.
  All of this in a loop.
  The main thread does :

• bind to address ;

• poll incoming ;

• read a empty query ;

• respond with empty response.
  All of this in a loop.

The server part does :

• bind to address ;

• poll incoming ;

• read a query and print the number contained in it ;

• respond an empty response ;

• create a socket ;

• connect to the client ;

• send data ;

• read response ;

The server part is a

http://pastebin.com/S9iZM8Av server
http://pastebin.com/5y3c5SaA client

The problem does not occur on freebsd 9-rc3 but does on other linux tested.
It does not occur with "ipc://" instead of "tcp://"

Attached is a picture of what the intel profilers says.