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 :

quoted

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.