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Message-ID: <20120626130224.GD12887@openwall.com>
Date: Tue, 26 Jun 2012 17:02:24 +0400
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: mschap-v2 conversion
On Tue, Jun 26, 2012 at 10:06:47AM +0200, magnum wrote:
> Solar may respond much better when he gets some more time.
I'm sorry, but my opinion is that tuning OpenMP performance with the
current early/experimental bitslicing implementation for this format is
premature.
Notice that the speedup from bitslicing without OpenMP is quite low,
compared to what we're seeing for purely DES formats (much higher
speedup there). I guess this might be because of the uses of MD4 and
the conversions to/from bitslice representation, but that does not
explain the low speed for the "many salts" case (the uses of MD4 are in
key setup only). We need to seriously look into this and see what can
be done about it. That may be a higher priority than premature
optimization of OpenMP builds.
Alexander
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