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

Adrian Chadd adrian at
Tue Jul 1 04:36:28 UTC 2008

2008/7/1 Sepherosa Ziehau <sepherosa at>:

> Properly configured #RX desc and timer intr interval will be required
> to make sure that the RX desc collection could keep up with the
> hardware speed.  I used pure timer intr (8000Hz) on nfe(4) in dfly w/
> good result, i.e. TX/RX @linespeed without livelocking the system.
> The drawback of pure timer intr is that you waste extra cpu power,
> when there is nothing to process.

What packet rate is "linespeed" ? With what size packets?


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