Encryption method for best speed

I've attempted to google an answer to this question but without much
luck.

Where is an understandable and recent web page (or NG cite, Etc.) that
provides encryption method and speed information? In particular, I
want to create an encrypted file and loop mount it. DM-Crypt kills
performance (I have benchmarks to prove that!), so I want an alternate
_FAST_ but reasonably secure method.

The current files to be encrypted sum to 31G.
Thanks for any pointers,
buck

Ertugrul =?UTF-8?B?U8O2eWxlbWV6?= <es DeleteThis @ertes.de> wrote in
news:20090209024736.22353d9e@ertes.de:

> buck <buck DeleteThis @private.mil> wrote:
>
>> Where is an understandable and recent web page (or NG cite, Etc.)
>> that provides encryption method and speed information? In
>> particular, I want to create an encrypted file and loop mount it.
>> DM-Crypt kills performance (I have benchmarks to prove that!), so I
>> want an alternate _FAST_ but reasonably secure method.
>
> If dm-crypt kills your performance, then probably you have an old or
> improperly configured kernel. While configuring, you can select to
> enable cipher implementations, which are optimized for your particular
> architecture. The implementations from the Linux kernel are already
> quite fast.

DM-Crypt defaults to AES mode cbc-essiv:sha256, which was compiled for
kernel 2.6.24.5_smp (Slackware 12.1 then, 12.2 now). How much more can
one optimize? My benchmark files have long since been deleted, but
encryption, because it uses only one CPU, was definitely a problem. I
found this, which clearly demonstrates my assertion that encryption is
the bottleneck:
http://tynne.de/linux-crypto-speed
which indicates aes586 module - which will have to be located because it
isn't a module on my machine. There is no date on the page, but the
kernel version isn't horribly old (2.6.21.4).

> Greets,
> Ertugrul.

Wikipedia lists so many algorithms that it takes 4 lines of text to
display them all.

Thanks,
buck