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Date: Wed, 26 Aug 2015 10:35:24 +0300
From: Solar Designer <>
Subject: Re: LWS and GWS auto-tuning

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?


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