Openwall GNU/*/Linux - a small security-enhanced Linux distro for servers
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Date: Thu, 27 Apr 2006 18:26:18 +0200
From: Simon Marechal <>
Subject: Re: Performance tuning


	I have a small question and a suggestion:

Solar Designer wrote:
> some P4 models and a little bit slower on others.  On Pentium 3 and on
> AMD processors, the SSE code is slower in all cases (for the benchmarks
> I've performed or have seen so far).  I imagine that on future

There are twice as much sse registers on amd64 than on 32bits mode. Do
you use this feature?

I think a cool feature would be to add a more "realistic" benchmark
option. If it would be possible to have john do candidate key setup,
hash and comparisons, instead of just hashing, it would reveal the cost
of slower key setup functions, usually associated with SIMD versions of
the cipher.

I think it should be on the TODO list as it doesn't look very hard to
implement and would tremendously help tuning john.

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