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

Paul paul at
Tue Jul 1 02:39:35 UTC 2008

All the NIC drivers in 7 pretty much use interrupt moderation so it can 
never lock the machine anyway.. This effectively kills polling and it 
really no longer has any use except to be able to have a fraction of the 
cpu set aside for user space but you can do that anyway with SMP

Support (Rudy) wrote:
> Ingo Flaschberger wrote:
>> usually interface polling is also chosen to prevent "lock-ups".
>> man polling
> 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?
> Rudy
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