Freebsd IP Forwarding performance (question, and some info) [7-stable, current, em, smp]

Steve Bertrand steve at
Thu Jul 3 16:40:52 UTC 2008

Ingo Flaschberger wrote:
> Dear Steve,
>>> My next "router" appliance will be:
>> This is exactly the device that I have been testing with (just 
>> rebranded).
> cool.
> what performace do you reach?

After some very quick testing with everything default, I am witnessing 
results that are far below what I would have expected. I have a few 

- how do I identify if polling on an interface is enabled? I see no 
difference with ifconfig output

- do I need to compile a new kernel to be able to enable/disable polling?

- without moving some hardware around, I only have a single box 
connected to a router, and I've been testing from that box to a 
different interface within the router. Will the test results be optimal 
if I ping all the way through the router to a second device connected to 

- how are the results affected when generating and receiving the test 
packets within the router itself (as opposed to using outside devices)?


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