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

Brian McGinty brian.mcginty at
Tue Jul 8 21:13:49 UTC 2008

> I have a pre-production card. With some bug fixes and some tuning of
> interrupt handling (custom stack - I've been asked to push the changes
> back in to CVS, I just don't have time right now) an otherwise
> unoptimized igb can forward 1.04Mpps from one port to another (1.04
> Mpps in  on igb0 and 1.04 Mpps out on igb1) using 3.5 cores on an 8
> core system.

I have a 8 core system running stock Linux that easily does line rate
(ie, 1.488 Mpps) on 3 (82575) interfaces. Ie, 3 * 1.48 Mpps!


> -Kip
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