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

Stefan Lambrev stefan.lambrev at
Tue Jul 1 09:17:29 UTC 2008

Greetings Paul,
> ------OK I'm stumped now.. Rebuilt with preemption and ULE and 
> preemption again and it's not doing what it did before..
I saw this in my configuration too :) Just leave your test running for 
longer time and you will see this strange inconsistency in action.
In my configuration I almost always have better throughput after reboot, 
which drops latter (5-10min under flood) with 50-60kpps and after 
another 10-15min the number of correctly passed packet increase again. 
Looks like "auto tuning" of which I'm not aware :)

> How could that be? Now about 500kpps..
> That kind of inconsistency almost invalidates all my testing.. why 
> would it be so much different after trying a bunch of kernel options 
> and rebooting a bunch of times and then going back to the original 
> config doesn't get you what it did in the beginning..
> I'll have to dig into this further.. never seen anything like it :)
> Hopefully the ip_input fix will help free up a few cpu cycles.
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Best Wishes,
Stefan Lambrev
ICQ# 24134177

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