IRQ storm

[Josh Carroll]

> I've changed motherboard recently (now it is Intel DP965LT) and now I
> have my PC slowed down considerably. vmstat -i shows a huge amount of
> interrupts on irq17: atapci0:

Do you have atapicam enabled or being loaded as a module? If so, I
have the same problem, which is currently being tracked in this PR:

http://www.freebsd.org/cgi/query-pr.cgi?pr=103602

A workaround, if you don't need/want to burn cds/dvds is to remove
atapicam or don't load the module at boot time.

Thanks,
Josh