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. Download attachment "signature.asc" of type "application/pgp-signature" (474 bytes)
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