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

James Y Knight foom at fuhm.net
Wed Jan 26 16:32:40 EST 2005

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.


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