[Twisted-Python] high server loads on FreeBSD - does kqueue reactor help?

[Werner Thie]

Hi all

With a four core, four twisted http server processes (nevow/athena on 
top), dual 100 MBps interfaces, all four cores showing CPU loads of 50% 
  plus, I observe the following degradation in the network traffic with 
tcpdump:

- 'TCP checksum incorrect' raising to almost 25% of all packets observed 
  from one client IP
- TCP Ack'ed lost segment raising to 0.5% of all packets observed

This was with poll reactor on FreeBSD 7.0

- Would it be of any help to switch to kqueue in this case?
- If so, is the documentation about using and patching PyKQueue-1.3 as 
given in

http://twistedmatrix.com/documents/8.2.0/api/twisted.internet.kqreactor.html

correct and up to date, given that on

http://people.freebsd.org/~dwhite/PyKQueue/

the actual version mentioned is 1.2

Thanks in advance, Werner