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Reducing NIC interrupt servicing load

To: misc@openbsd.org
Subject: Reducing NIC interrupt servicing load
From: Steve Shorter <steve@nomad.tor.lets.net>
Date: Tue, 22 Mar 2005 15:15:14 -0500
Sender: owner-misc@openbsd.org
User-agent: Mutt/1.4i
Howdy!

        I have an OpenBSD router/firewall with multiple Intel NIC
including a single mode fibre card. I am pushing about 150M out
of the interface and the interupt load reported by top shows
15% - 20% idle. Is there any tuning that can be done to get more bandwidth
out of this machine? This is currently a single 2.8 Ghz Xeon machine running
obsd 3.6.  Will SMP help by distributing the load across two processors
or is there some issue with SMP and NIC interupts that prevent
this from happening?

        thanx - steve

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