linux-kernel - Re: [PATCH 0/3] Add optimized SHA-1 implementations for x86 and x86

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Message-ID: <20070611203032.GI3588@stusta.de>
Date:	Mon, 11 Jun 2007 22:30:32 +0200
From:	Adrian Bunk <bunk@...sta.de>
To:	Benjamin Gilbert <bgilbert@...cmu.edu>
Cc:	akpm@...ux-foundation.org, herbert@...dor.apana.org.au,
	linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] Add optimized SHA-1 implementations for x86 and
	x86_64

On Fri, Jun 08, 2007 at 05:42:42PM -0400, Benjamin Gilbert wrote:
> The following 3-part series adds assembly implementations of the SHA-1
> transform for x86 and x86_64.  For x86_64 the optimized code is always
> selected; on x86 it is selected if the kernel is compiled for i486 or above
> (since the code needs BSWAP).  These changes primarily improve the
> performance of the CryptoAPI SHA-1 module and of /dev/urandom.  I've
> included some performance data from my test boxes below.
> 
> This version incorporates feedback from Herbert Xu.  Andrew, I'm sending
> this to you because of the (admittedly tiny) intersection with arm and s390
> in part 1.
> 
> -
> 
> tcrypt performance tests:
> 
> === Pentium IV in 32-bit mode, average of 5 trials ===
> Test#  Bytes/  Bytes/  Cyc/B  Cyc/B  Change
>...
> I've also done informal tests on other boxes, and the performance
> improvement has been in the same ballpark.
> 
> On the aforementioned Pentium IV, /dev/urandom throughput goes from 3.7 MB/s
> to 5.6 MB/s with the patches; on the Core 2, it increases from 5.5 MB/s to
> 8.1 MB/s.
>...

With which gcc version and compiler flags?

And why is the C code slower?
Problems in the C code?
gcc problems?

Generally, I'd really prefer one C implementation that works good on all 
platforms over getting dozens of different assembler implemenations, 
each potentially with different bugs.

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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