linux-kernel - Re: [PATCH 2/3] [CRYPTO] Add optimized SHA-1 implementation for i486+

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Date:	11 Jun 2007 14:04:05 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Matt Mackall <mpm@...enic.com>
Cc:	Benjamin Gilbert <bgilbert@...cmu.edu>, akpm@...ux-foundation.org,
	herbert@...dor.apana.org.au, linux-crypto@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] [CRYPTO] Add optimized SHA-1 implementation for i486+

Matt Mackall <mpm@...enic.com> writes:
> 
> Have you benchmarked this against lib/sha1.c? Please post the results.
> Until then, I'm frankly skeptical that your unrolled version is faster
> because when I introduced lib/sha1.c the rolled version therein won by
> a significant margin and had 1/10th the cache footprint.

I would always suggest to benchmark such functions with forced cold i/d caches

(memset(x, 0, 5*1024*1024) and running some very large generated
function every few iterations of the benchmark) 

-Andi
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