TCP-RENO in Linux

Hello.

Sorry, maybe this question not for netdev mailing list.

Does anybody works with TCP congestion control (RENO)?
I'm observe strange behavior of RENO: number of
TCP-segments transmitted with some value of 
window is much more than this value.

For example: if window size is 212 it is
transmits 450 segments with such window size.

Can you give me some ideas or search direction.
I will be very thankful to you.

--
With best regards, Alexander Sannikov.