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Date: Thu, 5 Jun 2003 11:18:08 -0400
From: Damian Gerow <damian@sentex.net>
To: net@freebsd.org
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Subject: Re: polling in 5.1-RC1 causes 100% CPU usage
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Thus spake Damian Gerow (damian@sentex.net) [04/06/03 17:52]:
> I just upgraded a home firewall from 4.8-STABLE to 5.1-RC1.  In the process
> of updating, I also brought in a new motherboard, CPU, and memory.  However,
> all the NICs in the box are the same.
> 
> The problem is that with polling turned on, CPU usage sits at 100%.  As soon
> as I turn /off/ polling, it drops.  This is very easily reproducible:
> 
>     # sysctl -w kern.polling.enable=1
> 
> Then do a 'systat -vm', and watch as the interrupt load jumps from about
> 0.5% to 18-19%.

Hmmmm..  Perhaps I could have included more details?

The system /was/ a P100S, and is now a Via C3.  The three network cards are
one rl and two fxp.