RELENG_7 heavy disk = system crawls

Bill Moran wmoran at
Wed Aug 12 12:14:35 UTC 2009

grarpamp <grarpamp at> wrote:
> > cards aren't going to help with zfs.
> No, but for geli hifn(4) crypto(4)/(9), geli(8) might work
> if aes-cbc is indeed the mode geli uses. See the source I guess.

Note that only the most expensive cards are faster than a CPU.  Unless you've
got a very large budget, you'll get more bang for your buck out of adding CPUs
to the unit.  During crypto ops, the system will have a spare CPU to use to
encrypt, and when not doing crypto ops, you have the added benefit of more
processing power for apps.

Additionally, support for FreeBSD is spotty.  And we've seen cards that work in
FreeBSD, but do so at far below their claimed throughput.  There are apparently
some inefficiencies in the drivers.

Bill Moran
Collaborative Fusion Inc.

wmoran at
Phone: 412-422-3463x4023

IMPORTANT: This message contains confidential information
and is intended only for the individual named. If the reader of
this message is not an intended recipient (or the individual
responsible for the delivery of this message to an intended
recipient), please be advised that any re-use, dissemination,
distribution or copying of this message is prohibited. Please
notify the sender immediately by e-mail if you have received
this e-mail by mistake and delete this e-mail from your system.
E-mail transmission cannot be guaranteed to be secure or
error-free as information could be intercepted, corrupted, lost,
destroyed, arrive late or incomplete, or contain viruses. The
sender therefore does not accept liability for any errors or
omissions in the contents of this message, which arise as a
result of e-mail transmission.

More information about the freebsd-performance mailing list