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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