Giant and MPSAFE

[Ben Paley]

Hello,

bash-2.05b$ uname -a
FreeBSD potato.hogsedge.net 5.3-BETA5 FreeBSD 5.3-BETA5 #0: Mon Sep 20 
07:49:52 BST 2004     root at potato.hogsedge.net:/usr/obj/usr/src/sys/POTATO  
i386

I've just noticed a nasty looking message at boot:

WARNING: debug.mpsafenet forced to 0 as aio requires Giant
WARNING: MPSAFE network stack disabled, expect reduced performance.

And then subsequently there are a good few references to things being (from 
memory)

[GIANT LOCKED]

Anyone have any idea what this is about, and if it's actually bad, and how I 
can sort it out?

Thanks a lot,
Ben