From owner-freebsd-net@FreeBSD.ORG  Wed May 24 13:53:05 2006
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Date: Wed, 24 May 2006 15:53:02 +0200
From: Frank Steinborn <steinex@nognu.de>
To: Michel Gravey <michel.gravey@7ici.biz>
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Cc: freebsd-net@freebsd.org
Subject: Re: question about MPSAFE network stack disabled
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Michel Gravey wrote:
> Hello all,
> I've got the following message during boot (on a 6.1 release custom kernel) 
> WARNING: MPSAFE network stack disabled, expect reduced performance.

[...]

> Would you please help me to find the cause of that message, to fix the 
> resulting degraded performance induced by that problem.

First: What version are you running? IIRC, MPSAFE was disabled
somewhere in the early stages of 5.x - are you running such a version?

Second, please check your /boot/loader.conf - could it be that you
added that line: debug.mpsafenet="0"? If so, remove it. It's only
needed to workaround a bug in FreeBSD-pf AFAIK.