Re: x86 SHA1: Faster than OpenSSL

From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Aug 6, 2009, 04:01 UTC
Message-ID: <alpine.LFD.2.01.0908052056500.3390@localhost.localdomain>
In-Reply-To: <alpine.LFD.2.01.0908052043082.3390@localhost.localdomain>

On Wed, 5 Aug 2009, Linus Torvalds wrote:

> 
> Here's the patch that gets me sub-28s git-fsck times. In fact, it gives me 
> sub-27s times. In fact, it's really close to the OpenSSL times.

Just to back that up:

 - OpenSSL:

	real	0m26.363s
	user	0m26.174s
	sys	0m0.188s

 - This C implementation:

	real	0m26.594s
	user	0m26.310s
	sys	0m0.256s

so I'm still slower, but now you really have to look closely to see the difference. In fact, you have to do multiple runs to make sure, because the error bars are bigger thant he difference - but openssl definitely edges my C code out by a small amount, and the above numbers are rairly normal.

		Linus

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