Date: Sat, 22 Sep 2012 09:39:53 +0400 From: Solar Designer <solar@...nwall.com> To: john-dev@...ts.openwall.com Subject: Re: bitslice DES on GPU On Sat, Sep 22, 2012 at 10:58:50AM +0530, Sayantan Datta wrote: > I gave it a detailed thought to your calculations. In fact doubling the > work items shouldn't affect the speeds anyway. for example: > > H c/s = W/(O+C) : where W = no. of work items > O = time spent on overhead. > C = time spent on actual > (non-overhead) hashing. > H = actual real world speed. > So if W is doubled , O and C should get doubled automatically as both O and > C are proportional to W. This sounds right to me. > What happened is that I manged to reduce the overhead (using different > code) while slowing down the actual hashing(using different kernel). OK. > Anyway I managed to improve the non-overhead speeds to 59M c/s using > nvidia s-boxes and putting B in private register space on 7970. Good. We're getting somewhere. > AMD s-boxes aren't working . In what way are they non-working? Thanks, Alexander
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