Date: Wed, 02 Sep 2015 02:00:30 +0200 From: magnum <john.magnum@...hmail.com> To: john-dev@...ts.openwall.com Subject: Re: 23% performance regression for brypt (Intel i5-4570 CPU) On 2015-04-12 12:14, Frank Dittrich wrote: > Solar, > > you included the bcrypt related changes of bleeding-jumbo commit > https://github.com/magnumripper/JohnTheRipper/commit/f64b42fee9e368cd85cf546f08b694510824fea2 > into core, but decided to not allow BF_X2 = 3 for AVX systems. > (I guess this is because on well BF_X2 = 3 causes about 5% performance > regression.) > > But for my system (64bit Linux, i5-4570 CPU), this causes a 23% > performance regression. Same here, on i7-3615QM (Ivy Bridge, AVX), OSX, gcc 4.9.2. Using X3 I get 27% boost for a non-OMP build, 22% for OMP and while it's just 4% boost for OMP+HT, it still is a boost. > May be you also reconsider allowing BF_X2 = 3 for AVX. If only well had a regression, perhaps decrease to X2 only for __AVX2__? Or maybe this is also about gcc version? > Is there anything I can test, any more information you need to decide > when BF_X2 should be 3 even for AVX, and when it shouldn't? https://github.com/magnumripper/JohnTheRipper/issues/1199 magnum
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