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From: "Theodore Ts'o" <tytso@mit.edu>
To: George Spelvin <linux@sciencehorizons.net>
Cc: eric.dumazet@gmail.com, Jason@zx2c4.com, ak@linux.intel.com,
	davem@davemloft.net, David.Laight@aculab.com, djb@cr.yp.to,
	ebiggers3@gmail.com, hannes@stressinduktion.org,
	jeanphilippe.aumasson@gmail.com,
	kernel-hardening@lists.openwall.com,
	linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org,
	luto@amacapital.net, netdev@vger.kernel.org, tom@herbertland.com,
	torvalds@linux-foundation.org, vegard.nossum@gmail.com
Subject: Re: HalfSipHash Acceptable Usage
Date: Wed, 21 Dec 2016 17:27:02 -0500	[thread overview]
Message-ID: <20161221222702.h2vboms776zpgpi4@thunk.org> (raw)
In-Reply-To: <20161221183751.1123.qmail@ns.sciencehorizons.net>

On Wed, Dec 21, 2016 at 01:37:51PM -0500, George Spelvin wrote:
> SipHash annihilates the competition on 64-bit superscalar hardware.
> SipHash dominates the field on 64-bit in-order hardware.
> SipHash wins easily on 32-bit hardware *with enough registers*.
> On register-starved 32-bit machines, it really struggles.

And "with enough registers" includes ARM and MIPS, right?  So the only
real problem is 32-bit x86, and you're right, at that point, only
people who might care are people who are using a space-radiation
hardened 386 --- and they're not likely to be doing high throughput
TCP connections.  :-)

					- Ted

  parent reply	other threads:[~2016-12-21 22:27 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-12-19 17:32 Jason A. Donenfeld
     [not found] ` <CAGiyFdduUNSGq24zfsk0ZU=hnOCmewAw8vw6XvDoS-3f+3UPKQ@mail.gmail.com>
2016-12-19 21:00   ` Jason A. Donenfeld
2016-12-20 21:36 ` Theodore Ts'o
2016-12-20 23:07   ` George Spelvin
2016-12-20 23:55   ` Eric Dumazet
2016-12-21  3:28     ` George Spelvin
2016-12-21  5:29       ` Eric Dumazet
2016-12-21  6:34         ` George Spelvin
2016-12-21 14:24           ` Jason A. Donenfeld
2016-12-21 15:55             ` George Spelvin
2016-12-21 16:37               ` Jason A. Donenfeld
2016-12-21 16:41               ` [kernel-hardening] " Rik van Riel
2016-12-21 17:25               ` Linus Torvalds
2016-12-21 18:07                 ` George Spelvin
2016-12-22  1:54                 ` Andy Lutomirski
2016-12-21 14:42         ` Jason A. Donenfeld
2016-12-21 15:56           ` Eric Dumazet
2016-12-21 16:33             ` Jason A. Donenfeld
2016-12-21 16:39             ` [kernel-hardening] " Rik van Riel
2016-12-21 17:08               ` Eric Dumazet
2016-12-21 18:37             ` George Spelvin
2016-12-21 18:40               ` Jason A. Donenfeld
2016-12-21 22:27               ` Theodore Ts'o [this message]
2016-12-22  0:18                 ` George Spelvin
2016-12-22  1:13                 ` George Spelvin

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