Date: Sun, 21 Aug 2011 21:05:28 +0400 From: Solar Designer <solar@...nwall.com> To: john-users@...ts.openwall.com Subject: Re: John with Radeon graphical card supports? On Fri, Aug 19, 2011 at 09:36:35AM +0200, Samuele Giovanni Tonon wrote: ... > however bottleneck at the moment is not about COMPUTING power but > transfer speed; ... Our code should be made such that this would not be the case. And when it is the case, then I suspect that the CPU is also a bottleneck, likely more so than the PCIe bandwidth. > Also when you say multiple cards are you referring to SLI (or crossfire) > or just a "put different gpu on the same motherboard" and make them work ? Other password crackers don't rely on SLI/CrossFire, and we should neither. Moreover, we should also try to minimize the bandwidth needs, to support graphics cards in PCIe 1x slots - which is what people use to put 4 cards onto inexpensive motherboards with only one 16x slot: http://blog.zorinaq.com/?e=42 http://blog.zorinaq.com/?e=43 http://blog.zorinaq.com/?e=44 http://blog.zorinaq.com/?e=47 http://blog.zorinaq.com/?e=53 For slow hashes, this should be easy. For fast hashes, I expect that initially we'll be CPU- and bandwidth-bound, but we'll partially solve this by optionally moving candidate password generation and hash comparisons onto GPUs, likely at the expense of a less optimal order in which candidate passwords are tried. On Sun, Aug 21, 2011 at 02:16:07AM -0500, Richard Miles wrote: > He also told that Radeon are much better for cracking in comparison > with GeForce. Yes, they're about 3x faster currently, but we need suitable code for this to be seen. Alexander
Powered by blists - more mailing lists
Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.