Date: Thu, 8 Oct 2015 01:55:00 +0300 From: Solar Designer <solar@...nwall.com> To: john-users@...ts.openwall.com Subject: Re: nVidia Maxwell support (especially descrypt)? On Thu, Oct 08, 2015 at 12:33:44AM +0200, magnum wrote: > On 2015-10-07 23:37, Solar Designer wrote: > >On Wed, Oct 07, 2015 at 06:54:20PM +0200, magnum wrote: > >>BTW we now also use LOP3.LUT for many MD4, MD5 and SHA-2 OpenCL formats. > >>Some driver bug prevented me for using it in SHA-1 with nvidia 352.39 > >>(the code is there, just disabled) and md5crypt disable it because of > >>performance regression (still to be investigated). Some formats show a > >>fine boost but none as much as DEScrypt. > > > >... with our guess on why lower boost being that LOP3.LUT was often > >used anyway, introduced in the PTX to ISA translation. > > Right - actually I did not expect any boost, I just did it because I > could. But I'm puzzled by the md5crypt regression, Yeah, that's a bit puzzling. While our md5crypt-opencl uses around 600 bytes of private memory, there doesn't appear to be any spilling when targeting Titan X now, so I would expect it to be computation-bound on that GPU. Yet it runs much slower than expected (albeit faster than it does on other cards). > and the SHA-1 problem > (fails self-test). Perhaps the latter should be reported to nvidia, I > think they would actually look into it. Please give this a try if you have time. Thanks! Alexander
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