C100K Problem

http://www.kegel.com/c10k.html pretty outdated
Here is some cut from some servers (not a peak time yet even):

22921 connections established
...
13625 connections established                                                                                                                                                                         

A must tuning:

net.ipv4.tcp_tw_recycle=1                                                                                                                                                                                 
net.ipv4.tcp_tw_reuse=1                                                                                                                                                                                   
net.ipv4.tcp_orphan_retries=1

But i don't like tw options, they are crapping with NAT and port-redirectors.