Messages in this thread | | | Subject | Re: [PATCH 2/3] [CRYPTO] Add optimized SHA-1 implementation for i486+ | From | Andi Kleen <> | Date | 11 Jun 2007 14:04:05 +0200 |
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Matt Mackall <mpm@selenic.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)
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