Date: Sun, 8 Jul 2012 13:06:37 +0400 From: Solar Designer <solar@...nwall.com> To: john-dev@...ts.openwall.com Subject: Re: -atom make targets On Sun, Jul 08, 2012 at 10:19:38AM +0200, Frank Dittrich wrote: > [fd@fdn run]$ ./john-linux-x86-any --test=10 --format=md5 > Benchmarking: FreeBSD MD5 [32/32]... DONE > Raw: 4267 c/s real, 4275 c/s virtual > > [fd@fdn run]$ ./john-generic --test=10 --format=md5 > Benchmarking: FreeBSD MD5 [32/32]... DONE > Raw: 3191 c/s real, 3198 c/s virtual ... > So, sse, mmx and any are similar, generic is disappointing. > That looks like there is something wrong with build generic (or with > bench.c). Not really. -x86-any uses asm code, generic is pure C. Either may reasonably be slower on a given CPU. What this means is that the optimizations I made for the original Pentium in 1990s are also good for Atom. One other minor detail is that generic never enables ARCH_ALLOW_UNALIGNED, though. Jim's patch will address that, which should bring the performance you're getting in a generic build a little bit closer to -x86-any's (but still worse than it). Alexander
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