linux-kernel - Kernel crypto API: cryptoperf performance measurement

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Date:	Sun, 17 Aug 2014 17:55:51 +0200
From:	Stephan Mueller <smueller@...onox.de>
To:	linux-crypto@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org,
	Herbert Xu <herbert@...dor.apana.org.au>
Subject: Kernel crypto API: cryptoperf performance measurement

Hi,

during playing around with the kernel crypto API, I implemented a performance 
measurement tool kit for the various kernel crypto API cipher types. The 
cryptoperf tool kit is provided in [1].

Comments are welcome.

In general, the results are as expected, i.e. the assembler implementations 
are faster than the pure C implementations. However, there are curious results 
which probably should be checked by the maintainers of the respective ciphers 
(hoping that my tool works correctly ;-) ):

ablkcipher
----------

- cryptd is slower by factor 10 across the board

blkcipher
---------

- Blowfish x86_64 assembler together with the generic C block chaining modes 
is significantly slower than Blowfish implemented in generic C

- Blowfish x86_64 assembler in ECB is significantly slower than generic C 
Blowfish ECB

- Serpent assembler implementations are not significantly faster than generic 
C implementations

- AES-NI ECB, LRW, CTR is significantly slower than AES i586 assembler.

- AES-NI ECB, LRW, CTR is not significantly faster than AES generic C

rng
---

- The ANSI X9.31 RNG seems to work massively faster than the underlying AES 
cipher (by about a factor of 5). I am unsure about the cause of this.

Caveat
------

Please note that there is one small error which I am unsure how to fix it as 
documented in the TODO file.

[1] http://www.chronox.de/cryptoperf.html

-- 
Ciao
Stephan
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