linux-kernel - Re: [PATCH 1/3] Make /dev/urandom scalable

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Date:	Thu, 24 Sep 2015 15:00:32 -0500
From:	Jeff Epler <jepler@...ythonic.net>
To:	Austin S Hemmelgarn <ahferroin7@...il.com>
Cc:	Theodore Ts'o <tytso@....edu>, Andi Kleen <andi@...stfloor.org>,
	linux-kernel@...r.kernel.org, kirill.shutemov@...ux.intel.com,
	herbert@...dor.apana.org.au, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 1/3] Make /dev/urandom scalable

On Thu, Sep 24, 2015 at 03:11:23PM -0400, Austin S Hemmelgarn wrote:
> I will make a point however to run some tests over the weekend on a
> current kernel version (4.2.1), with the current dieharder version I
> have available (3.31.1).

Please report your findings.  If urandom is worse than AES_OFB in
statistical tests, we need to know about it.

I'm an hour into some test-to-failure runs of diehard_count_1s_str on
various RNGs -- urandom, AES_OFB, mt19937_1999, and rand48.  So far at
psamples >=29000 none have failed, so there's no result to report. (test
8 was chosen by mere human pseudorandomness; hey, it finds in <2s that
RANDU is a flawed generator)

    dieharder -d 8 -g 205 -Y 2 -k 2
    dieharder -d 8 -g 200 -Y 2 -k 2
    dieharder -d 8 -g 14 -Y 2 -k 2
    dieharder -d 8 -g 22 -Y 2 -k 2

If the results are other than "both urandom and aes_ofb were running
when I had to reboot my laptop", I'll report my results as well.

Jeff
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