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Date: Wed, 21 Dec 2016 09:08:21 -0800
From: Eric Dumazet <>
To: Rik van Riel <>
Cc:, "Jason A. Donenfeld"
 <>,  George Spelvin <>, Theodore
 Ts'o <>, 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
 <>, Vegard Nossum <>
Subject: Re: Re: HalfSipHash Acceptable Usage

On Wed, 2016-12-21 at 11:39 -0500, Rik van Riel wrote:

> 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.

Well, maybe they have millions of units to replace.

> In short, I am not sure how important the P4
> performance numbers are, especially if we can
> improve security for everybody else...

Worth adding that the ISN or syncookie generation are less than 10% of
the actual cost of handling a problematic (having to generate ISN or
syncookie) TCP packet anyway.

So we are talking of minors potential impact for '2000-era' cpus.

Definitely I vote for using SipHash in TCP ASAP.

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