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
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