Crypto performance with focus on GELI-based disk encryption

Does anyone have data on that subject? I'm planning to use
GELI encryption and 
was wondering what options I might have for crypto
acceleration hardware and 
what performance gains (if any) I could expect from it.

Cheers,
-- 
   ,_,   | Michael Nottebrock               | lofifreebsd.org
 (/^ ^) | FreeBSD - The Power to Serve     | http://www.freebsd.org
   u/   | K Desktop Environment on FreeBSD | http://freebsd.kde.org