Date: Wed, 7 Sep 2016 15:25:16 +0200 From: Solar Designer <solar@...nwall.com> To: john-dev@...ts.openwall.com Subject: Re: Intel KNL test machine Hi Lei, On Wed, Sep 07, 2016 at 07:41:06PM +0800, Lei Zhang wrote: > It's been a while since I last posted to john-dev :D Welcome back! > I've just got access to a new KNL machine; I'm not sure what exact > model it is, but it has 64x4 cores and /proc/cpuinfo says "Intel(R) > Xeon Phi(TM) CPU 7210 @ 1.30GHz". > > I guess some of you might be interested how JtR performs on this > beast. Just let me know if there's any kind of benchmark you want me > to test. And please keep the benchmarking easy to follow, or I may not > have enough time for it :) Yes, thanks. Lukas already ran some benchmarks on a similar device, but I think he never published those, in part because the descrypt ones were for AVX2 rather than AVX-512. We need to fix the code so that we would use AVX-512 for descrypt - this might be as simple as treating __AVX512F__ same as __MIC__ in more places - perhaps in DES_bs_b.c and in some .h files. Maybe you can fix this for and prior to running your benchmarks? As to what benchmarks, let's start with a simple "--test" of the CPU formats (treating this device as a CPU). Alexander
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