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Date: Thu, 10 Oct 2013 21:41:40 +1100 From: Paul Mackerras <paulus@...ba.org> To: "H. Peter Anvin" <hpa@...or.com> Cc: Stanimir Varbanov <svarbanov@...sol.com>, Theodore Ts'o <tytso@....edu>, Rob Herring <rob.herring@...xeda.com>, Pawel Moll <pawel.moll@....com>, Mark Rutland <mark.rutland@....com>, Stephen Warren <swarren@...dotorg.org>, Ian Campbell <ijc+devicetree@...lion.org.uk>, Matt Mackall <mpm@...enic.com>, Herbert Xu <herbert@...dor.hengli.com.au>, linux-kernel@...r.kernel.org, Rob Landley <rob@...dley.net>, devicetree@...r.kernel.org, linux-doc@...r.kernel.org, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, linux-arm-msm@...r.kernel.org Subject: Re: [PATCH 0/2] Add support for Qualcomm's PRNG On Wed, Oct 09, 2013 at 08:07:35AM -0700, H. Peter Anvin wrote: > consider the PowerPC random number generator[1]) and [snip] > [1] which has a known first-order bias which they "correct" for by > XORing two datums together in a very simple data reduction step. 65 actually, not two. > However, if their random source has bias it is extremely likely it also > has nonzero correlations, which require stronger reductions. It would The correlations are essentially zero, by design, and experiment confirms it. Did you see my mail on the kvm list where I explained how it works? Paul. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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