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Date: Wed, 26 Aug 2015 10:53:10 +0200
From: magnum <john.magnum@...hmail.com>
To: john-dev@...ts.openwall.com
Subject: Re: LWS and GWS auto-tuning

On 2015-08-26 09:35, Solar Designer wrote:
> On Tue, Aug 25, 2015 at 08:36:44PM +0200, magnum wrote:
>> Ratio:	0.79120 real, 1.11111 virtual	sha512crypt-opencl, crypt(3) $6$
>
> I cannot confirm the slowdown for sha512crypt-opencl on Tahiti.  To me,
> it auto-tunes similarly, and results in similar poor speed.
>
> BTW, it appears to be limited to LWS 256.  I think 512 might work
> better, like it does on TITAN (where 512 results in lower GWS, too).
> But I can't easily find where that limit is.  magnum, can you?

Claudio would know. My guess is it comes from some device query.

magnum

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