I've been wondering for some time now just what are the entries in dmesg followed by [GIANT-LOCKED], [ITHREAD], [FILTER]...
On my server, FreeBSD 8.0-RELEASE-p2, CPU P4 3ghz, 4gb memory, X, fluxbox...
In particular, the [GIANT-LOCKED] entries refer to nvidia0, atkbd0, psm0.