Re: crypto accelerators
- From: Dave Cornejo <dave@xxxxxxxxxxx>
- Date: Tue, 18 Apr 2006 13:40:02 -1000 (HST)
On Mon, Apr 17, 2006 at 04:44:38PM -1000, Dave Cornejo wrote:
So the question is whether these cards, regardless of their affect on
throughput, increase usable CPU cycles? I have several Soekris 1401
cards and am wondering if there would be any point to putting them
into some machines that provide logins over ssh. These machines are
generally pretty good spec, 2.4GHz+, 1GB RAM, Intel MBs, mostly
on-board peripherals.
Given that spec of machine, I don't see that a hardware cipher would
offer much improvement -- and some of the available crypto accelerators
don't perform Diffie-Helmann or AES, some do.
I myself have a ubsec(4) card, and even when I hacked OpenSSH to use
OpenSSL engine support by default (with someone else's patch), I didn't
see that much improvement (even when I forced the use of MD5, RSA and
3DES).
I could be wrong though - the above is qualitative not quantitative.
Regards,
BMS
it sounds like you're thinking in terms of throughput and speed of the
encrypted connections, which i agree probably won't see much of an
improvement.
but it would seem to me that doing the heavy math off-CPU reduces the
amount of work the CPU does. are these saved CPU cycles available to
someone who might be doing a compilation on this machine?
Doug Ambriskos answer (thanks!) implies that maybe they are.
thanks,
dave c
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