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Message-ID: <CA+E3k91B7ym25hOTPx0b+gw-NX13m1C_REijk2JvMDMWcCwbUQ@mail.gmail.com>
Date: Thu, 11 Sep 2014 07:18:54 -0800
From: Royce Williams <royce@...ho.org>
To: john-users@...ts.openwall.com
Subject: Re: nVidia Maxwell support (especially descrypt)?
On Wed, Sep 10, 2014 at 11:54 PM, magnum <john.magnum@...hmail.com> wrote:
> On 2014-09-11 09:02, Royce Williams wrote:
>>
>> Because of the $150 price and relatively low power requirements (~60W,
>> no extra power connector needed) of the new nvidia Maxwell (GTX 750
>> and 750 Ti) cards, and my own interest in descrypt, I'm interested in
>> seeing JtR take advantage of Maxwell if feasible.
>
> As long as you have OpenCL drivers for it, it's supposed to work and any
> device-specific problems would be a bug (albeit not always "our" bug, I
> recently worked around some really silly bugs in latest AMD drivers).
To clarify for non-programmers like myself: is it up to the drivers,
and not JtR's implementation, to take advantage of the features that
Golubev gushes about?
>From http://www.golubev.com/blog/?p=291, after a breakdown of
code-specific changes he made:
"Maxwell architecture is simply the best among all GPUs (And, yes,
including AMD ones — because of constant problems with AMD’s buggy
software making fast hardware pointless). At least for
hashing/cryptography purposes."
>> I know that descrypt isn't exactly the hottest topic, but it might be
>> easy to use it as a Maxwell test case.
>
> BTW I just dropped the DEScrypt-opencl format to the broken/ subdirectory
> because it keeps giving me problems. For example, it fails building under
> later AMD drivers due to excessive use of 'goto'. Some other drivers commit
> suic^Wsegfault while trying to sort it out. I believe using goto in an
> OpenCL kernel is really begging for problems.
>
> To use it, simply move the files back from src/broken to src, reconfigure
> and re-build. I hope Sayantan will fix it (as well as the memory leak
> discussed before) at some point in time.
Hmm ... I don't see any activity from Sayantan on the mailing lists
since 2012, and his GitHub commits mostly died off a year ago:
https://github.com/magnumripper/JohnTheRipper/commits?author=Sayantan2048
Royce
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