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Message-ID: <1482338385.11006.67.camel@redhat.com>
Date: Wed, 21 Dec 2016 11:39:45 -0500
From: Rik van Riel <riel@...hat.com>
To: kernel-hardening@...ts.openwall.com,
"Jason A. Donenfeld"
<Jason@...c4.com>
Cc: George Spelvin <linux@...encehorizons.net>,
"Theodore Ts'o"
<tytso@....edu>, Andi Kleen <ak@...ux.intel.com>,
David Miller
<davem@...emloft.net>,
David Laight <David.Laight@...lab.com>,
"Daniel J .
Bernstein" <djb@...yp.to>,
Eric Biggers <ebiggers3@...il.com>,
Hannes
Frederic Sowa <hannes@...essinduktion.org>,
Jean-Philippe Aumasson
<jeanphilippe.aumasson@...il.com>,
Linux Crypto Mailing List
<linux-crypto@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>,
Andy
Lutomirski <luto@...capital.net>,
Netdev <netdev@...r.kernel.org>, Tom
Herbert <tom@...bertland.com>,
Linus Torvalds
<torvalds@...ux-foundation.org>,
Vegard Nossum <vegard.nossum@...il.com>
Subject: Re: Re: HalfSipHash Acceptable Usage
On Wed, 2016-12-21 at 07:56 -0800, Eric Dumazet wrote:
> On Wed, 2016-12-21 at 15:42 +0100, Jason A. Donenfeld wrote:
> George said :
>
> > Cycles per byte on 1024 bytes of data:
> > Pentium Core 2 Ivy
> > 4 Duo Bridge
> > SipHash-2-4 38.9 8.3 5.8
> > HalfSipHash-2-4 12.7 4.5 3.2
> > MD5 8.3 5.7 4.7
>
>
> That really was for 1024 bytes blocks, so pretty much useless for our
> discussion ?
>
> Reading your numbers last week, I thought SipHash was faster, but
> George
> numbers are giving the opposite impression.
>
> I do not have a P4 to make tests, so I only can trust you or George.
Does anybody still have a P4?
If they do, they're probably better off replacing
it with an Atom. The reduced power bills will pay
for replacing that P4 within a year or two.
In short, I am not sure how important the P4
performance numbers are, especially if we can
improve security for everybody else...
--
All Rights Reversed.
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