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Date: Sat, 11 Aug 2012 04:05:22 +0400
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: Current -fixes GPU formats vs TS

On Sat, Aug 11, 2012 at 01:59:14AM +0200, Lukas Odzioba wrote:
> I wasn't able to reproduce this bug that way (running xsha first) but
> it I was able to get 100% self test fails during ./john -test=0.
> This speedup is weird what is c/s, 3% seems to be more than error
> dispersion. I have no idea what is the source of this speedup. Maybe
> some powersaving mechanisms inside cuda impelentation or device
> itself.
> 
> On gtx470 I get 466->470 after adding memset.

Here's a guess: maybe the sequential writes to that memory - all at once -
prevent cache line loads from it later, when we make partial writes first
(different portions by different threads).

Alexander

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