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From: Herbert Xu <herbert@gondor.apana.org.au>
To: Stephan Mueller <smueller@chronox.de>
Cc: linux-crypto@vger.kernel.org
Subject: Re: [RFC] DRBG: which shall be default?
Date: Wed, 8 Jun 2016 16:00:55 +0800	[thread overview]
Message-ID: <20160608080055.GA13686@gondor.apana.org.au> (raw)
In-Reply-To: <7330387.0ZS018HYJD@positron.chronox.de>

On Wed, Jun 08, 2016 at 09:56:42AM +0200, Stephan Mueller wrote:
>
> The performance with ctr-aes-aesni on 64 bit is as follows -- I used my LRNG 
> implementation for testing for which I already have performance measurements:
> 
> - generating smaller lengths (I tested up to 128 bytes) of random numbers 
> (which is the vast majority of random numbers to be generated), the 
> performance is even worse by 10 to 15%
> 
> - generating larger lengths (tested with 4096 bytes) of random numbers, the 
> performance increases by 3%
> 
> Using ctr(aes-aesni) on 32 bit, the numbers are generally worse by 5 to 10%.

ctr(aes-aesni) is not the same thing as ctr-aes-aesni, the former
being just another way of doing what you were doing.  So did you
actually test the real optimised version which is ctr-aes-aesni?

Thanks,
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

  parent reply	other threads:[~2016-06-08  8:00 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-05-31 11:11 [PATCH] crypto: DRBG - reduce number of setkey calls Stephan Mueller
2016-05-31 11:23 ` [RFC] DRBG: which shall be default? Stephan Mueller
2016-06-02  8:40   ` Herbert Xu
2016-06-02  9:31     ` Stephan Mueller
2016-06-02  9:42       ` Herbert Xu
2016-06-02 12:06         ` Stephan Mueller
2016-06-08  2:41           ` Herbert Xu
2016-06-08  7:56             ` Stephan Mueller
2016-06-08  8:00               ` Stephan Mueller
2016-06-08  8:00               ` Herbert Xu [this message]
2016-06-08  8:58                 ` Stephan Mueller
2016-06-08  9:03                   ` Herbert Xu
2016-06-08  9:07                     ` Stephan Mueller
2016-06-08  9:15                       ` Herbert Xu
2016-06-08  9:32                         ` Stephan Mueller
2016-06-02 10:45 ` [PATCH] crypto: DRBG - reduce number of setkey calls Herbert Xu

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