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Date: Wed, 21 Dec 2016 19:40:12 +0100
From: "Jason A. Donenfeld" <>
To: George Spelvin <>
Cc: Eric Dumazet <>, Andi Kleen <>, 
	David Miller <>, David Laight <>, 
	"Daniel J . Bernstein" <>, Eric Biggers <>, 
	Hannes Frederic Sowa <>, 
	Jean-Philippe Aumasson <>,, 
	Linux Crypto Mailing List <>, LKML <>, 
	Andy Lutomirski <>, Netdev <>, 
	Tom Herbert <>, Linus Torvalds <>, 
	"Theodore Ts'o" <>, Vegard Nossum <>
Subject: Re: HalfSipHash Acceptable Usage

On Wed, Dec 21, 2016 at 7:37 PM, George Spelvin
<> wrote:
> SipHash annihilates the competition on 64-bit superscalar hardware.
> SipHash dominates the field on 64-bit in-order hardware.
> SipHash wins easily on 32-bit hardware *with enough registers*.
> On register-starved 32-bit machines, it really struggles.
> As I explained, in that last case, SipHash barely wins at all.
> (On a P4, it actually *loses* to MD5, not that anyone cares.  Running
> on a P4 and caring about performance are mutually exclusive.)

>From the discussion off list which examined your benchmark code, it
looks like we're going to move ahead with SipHash.

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