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

Bart Van Kerckhove bart at
Fri Jul 11 15:15:08 UTC 2008

Hash: SHA1

>> Good news is using iptables only adds a few percentage onto the CPU
>> usage.   But still, what's with that..
>> So far FreeBSD got the highest pps rating for forwarding. I  haven't
>> tried bridge mode.  Ipfw probably takes a big hit in that too though.
>> Looking for an 82575 to test..
> P.S. It was a nice chat, but what we can expect from the future? Any
> plans, patches etc?
> Someone suggested to install 8-current and test with it as this is the
> "fast" way to have something included in FreeBSD.
> I can do this - I can install 8-current, patch it and put it under
> load and report results, but need patches :)
> I guess Paul is in the same situation ..

I'm in the same situation as well.
Would anyone be interested in very specific work aimed at improving IP
I would happily put out a bounty for this, and I'm quite sure I'm not

PS Paul: idd you get around to testing C2D ?

Kind regards,

Met vriendelijke groet / With kind regards,

Bart Van Kerckhove
"There are 10 kinds of ppl; those who read binary and those who don't"



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