Christian Stigen Larsen <cslar...@gmail.com>:
>> An RTT of 87 ms is very high to begin with.  What does mininet do that
>> could cause such a high RTT?
> 
> Fair point.  Honestly, I don't know, but perhaps I can ask on mininet-discuss.
> 
> I thought it was simply due to the Python controller.  Remember it gets all
> packets and has to send down a forward-command for each.
> 
> But yeah, 47 ms extra per packet is quite the overhead (the
> link-latency configuration is 40 ms).

FYI, I got a tip that with recent versions of POX (it's on origin/dart, at 
least)
you can run POX with the --unthreaded-sh flag.

That decreased latency from an 80-100 ms to around 50 ms!  Again, this is
without any flows, so there is only about 10 ms RTT overhead in doing so.

That's pretty good!

-- 
Christian Stigen Larsen
_______________________________________________
discuss mailing list
discuss@openvswitch.org
http://openvswitch.org/mailman/listinfo/discuss

Reply via email to