[Twisted-Python] dramatic slowdown in pbbenchclient.py / pbbenchserver.py

[James Y Knight]

On Jan 26, 2005, at 1:48 PM, russ wrote:
> The slowdown only appears between two different computers.  If I run 
> it on a single computer I get 700 cps.  If I run it between two 
> separate computers but with one or two simultaneous deferreds, then 
> there's only a very minor slowdown.  I'm running on windows 2000 with 
> Twisted-1.3.0.win32-py2.3.exe.
> What do you think?  Is this a strange behaviour of twisted or is there 
> something screwed up with my networking?

It is possible this is due to the immediate-write behavior of twisted 
1.3 combined with the TCP Nagle algorithm. You could try calling 
transport.setTcpNoDelay(True) on both ends (the client and the server 
end) to see if that helps.

James