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

From	Theodore Ts'o <tytso@mit.edu>
Newsgroups	linux.kernel
Subject	Re: [PATCH 1/3] Make /dev/urandom scalable
Date	2015-09-25 22:30 +0200
Message-ID	<qcHMZ-3Ev-1@gated-at.bofh.it> (permalink)
References	(5 earlier) <qci2e-rV-23@gated-at.bofh.it> <qckdJ-3Kz-33@gated-at.bofh.it> <qcl9M-55S-7@gated-at.bofh.it> <qczFM-h5-7@gated-at.bofh.it> <qcGxz-1U9-9@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Fri, Sep 25, 2015 at 03:07:54PM -0400, Austin S Hemmelgarn wrote:
> 
> Interestingly, based on what dieharder is already saying about performance,
> /dev/urandom is slower than AES_OFB (at least, on this particular system,
> happy to provide hardware specs if someone wants).

Yeah, not surprised by that.  We're currently using a crypto hash
instead of AES, which means we're not doing any kind of hardware
acceleration.

Crazy applications that want to spend 100% of the CPU generating
random numbers instead of you know, doing _useful_ work
notwithstanding, /dev/urandom never had high performance as one of its
design goals.  The assumption was that if you needed that kind of
performance, you would use a user-space cryptographic random number
generator.

					- Ted
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Thread

[PATCH 1/3] Make /dev/urandom scalable Andi Kleen <andi@firstfloor.org> - 2015-09-23 01:20 +0200
  [PATCH 2/3] random: Make input to output pool balancing per cpu Andi Kleen <andi@firstfloor.org> - 2015-09-23 01:20 +0200
  Re: [PATCH 1/3] Make /dev/urandom scalable Andi Kleen <andi@firstfloor.org> - 2015-09-23 01:30 +0200
  Re: [PATCH 1/3] Make /dev/urandom scalable Rasmus Villemoes <linux@rasmusvillemoes.dk> - 2015-09-23 12:40 +0200
    Re: [PATCH 1/3] Make /dev/urandom scalable Andi Kleen <andi@firstfloor.org> - 2015-09-24 00:00 +0200
  Re: [PATCH 1/3] Make /dev/urandom scalable Austin S Hemmelgarn <ahferroin7@gmail.com> - 2015-09-23 21:50 +0200
    Re: [PATCH 1/3] Make /dev/urandom scalable Andi Kleen <andi@firstfloor.org> - 2015-09-24 01:30 +0200
      Re: [PATCH 1/3] Make /dev/urandom scalable Austin S Hemmelgarn <ahferroin7@gmail.com> - 2015-09-24 13:40 +0200
        Re: [PATCH 1/3] Make /dev/urandom scalable Theodore Ts'o <tytso@mit.edu> - 2015-09-24 15:20 +0200
          Re: [PATCH 1/3] Make /dev/urandom scalable Austin S Hemmelgarn <ahferroin7@gmail.com> - 2015-09-24 18:10 +0200
            Re: [PATCH 1/3] Make /dev/urandom scalable Jeff Epler <jepler@unpythonic.net> - 2015-09-24 19:00 +0200
              Re: [PATCH 1/3] Make /dev/urandom scalable Austin S Hemmelgarn <ahferroin7@gmail.com> - 2015-09-24 21:20 +0200
                Re: [PATCH 1/3] Make /dev/urandom scalable Jeff Epler <jepler@unpythonic.net> - 2015-09-24 22:10 +0200
                Re: [PATCH 1/3] Make /dev/urandom scalable Theodore Ts'o <tytso@mit.edu> - 2015-09-24 22:20 +0200
                Re: [PATCH 1/3] Make /dev/urandom scalable Austin S Hemmelgarn <ahferroin7@gmail.com> - 2015-09-25 13:50 +0200
                Re: [PATCH 1/3] Make /dev/urandom scalable Austin S Hemmelgarn <ahferroin7@gmail.com> - 2015-09-25 21:10 +0200
                Re: [PATCH 1/3] Make /dev/urandom scalable Theodore Ts'o <tytso@mit.edu> - 2015-09-25 22:30 +0200
                Re: [PATCH 1/3] Make /dev/urandom scalable Austin S Hemmelgarn <ahferroin7@gmail.com> - 2015-09-29 14:10 +0200
                Re: [PATCH 1/3] Make /dev/urandom scalable Austin S Hemmelgarn <ahferroin7@gmail.com> - 2015-09-29 14:00 +0200
  Re: [PATCH 1/3] Make /dev/urandom scalable Theodore Ts'o <tytso@mit.edu> - 2015-09-23 23:20 +0200
    Re: [PATCH 1/3] Make /dev/urandom scalable Andi Kleen <ak@linux.intel.com> - 2015-09-23 23:30 +0200

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