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

[Ingo Flaschberger]

Dear Paul,

> SMP DISABLED on my Opteron 2212  (ULE, Preemption on)
> Yields ~750kpps in em0 and out em1  (one direction)
> I am miffed why this yields more pps than
> a) with all 4 cpus running and b) 4 cpus with lagg load balanced over 3 
> incoming connections so 3 taskq threads

because less locking, less synchronisation, ....

> I would be willing to set up test equipment (several servers plugged into a 
> switch) with ipkvm and power port access
> if someone or a group of people want to figure out ways to improve the 
> routing process, ipfw, and lagg.
>
> Maximum PPS with one ipfw rule on UP:
> tops out about 570Kpps.. almost 200kpps lower ? (frown)

can you post the rule here?

> I'm going to drop in a 3ghz opteron instead of the 2ghz 2212 that's in here 
> and see how that scales, using UP same kernel etc I have now.

really, please try 32bit and 1 cpu.

Kind regards,
 	Ingo Flaschberger