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Date: Wed, 24 Jul 2013 04:34:59 +0400
From: Solar Designer <solar@...nwall.com>
To: john-dev@...ts.openwall.com
Subject: Re: PBKDF2-HMAC-SHA256

Lukas -

Thank you for the contribution!

On Mon, Jul 22, 2013 at 08:36:32PM +0200, Lukas Odzioba wrote:
> 2013/7/16 Lukas Odzioba <lukas.odzioba@...il.com>:
> > Benchmarking: PBKDF2-HMAC-SHA256, rounds=12000 [PBKDF2-SHA256]... (4xOMP) DONE
> > Raw:    704 c/s real, 176 c/s virtual
> 
> Attached OpenCL version:
> 
> Summary (GWS=65536, rounds=12k)
> 7990:	44887 c/s
> 7970:	41478 c/s

Oh, I guess this speed difference has nothing to do with 7990 vs. 7970,
but is about Catalyst version and clock rate differences (which we're
tuning on the 7990 to prevent its GPU 0 from overheating - so you'd get
different speeds on GPU 0 vs. GPU 1).  You need to check the current
clock rates before considering the performance numbers you obtain.

And indeed this is for one of two GPUs in the 7990.

Alexander

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