netdev - Re: HalfSipHash Acceptable Usage

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Message-ID: <20161221222702.h2vboms776zpgpi4@thunk.org>
Date:   Wed, 21 Dec 2016 17:27:02 -0500
From:   Theodore Ts'o <tytso@....edu>
To:     George Spelvin <linux@...encehorizons.net>
Cc:     eric.dumazet@...il.com, Jason@...c4.com, ak@...ux.intel.com,
        davem@...emloft.net, David.Laight@...lab.com, djb@...yp.to,
        ebiggers3@...il.com, hannes@...essinduktion.org,
        jeanphilippe.aumasson@...il.com,
        kernel-hardening@...ts.openwall.com, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org, luto@...capital.net,
        netdev@...r.kernel.org, tom@...bertland.com,
        torvalds@...ux-foundation.org, vegard.nossum@...il.com
Subject: Re: HalfSipHash Acceptable Usage

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