From: Artur Skawina <art.08.09@gmail.com>
Date: Thu, 06 Aug 2009 04:28:18 GMT
Subject: Re: x86 SHA1: Faster than OpenSSL
Message-ID: <4A7A5BE2.5070401@gmail.com>
In-Reply-To: <alpine.LFD.2.01.0908052056500.3390@localhost.localdomain>

Linus Torvalds wrote:
> 
> 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.

nice, the p4 microbenchmark #s:

#             TIME[s] SPEED[MB/s]
rfc3174         1.357       44.99
rfc3174         1.352       45.13
mozilla         1.509       40.44
mozillaas       1.133       53.87
linus          0.5818       104.9

so it's more than twice as fast as the mozilla implementation.

artur