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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