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

Stefan Lambrev stefan.lambrev at
Tue Jul 1 08:53:30 UTC 2008


Ingo Flaschberger wrote:
> Dear Rudy,
>> I used polling in FreeBSD 5.x and it helped a bunch.  I set up a new 
>> router with 7.0 and MSI was recommended to me.  (I noticed no 
>> difference when moving from polling -> MSI, however, on 5.4 polling 
>> seemed to help a lot.  What are people using in 7.0?
>> polling or MSI?
> if you have a inet-router with gige-uplinks, it is possible that there 
> will be (d)dos attacks.
> only polling helps you then to keep the router manageable (but 
> dropping packets).
Let me disagree :)
I'm experimenting with bridge and Intel 82571EB Gigabit Ethernet Controller.
On quad core system I have no problems with the stability of the bridge 
without polling.
taskq em0 takes 100% CPU, but I have another three (cpus/cores) that are 
free and the router is very very stable, no lag on other interfaces
and the average load is not very high too.
> Kind regards,
>     Ingo Flaschberger
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Best Wishes,
Stefan Lambrev
ICQ# 24134177

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