netdev - Re: [kernel-hardening] Re: HalfSipHash Acceptable Usage

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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: [kernel-hardening] 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...

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