linux-kernel - Re: [PATCH] crypto: fix FTBFS with ARM SHA1-asm and THUMB2

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Date:	Tue, 22 Jan 2013 09:46:14 +0200
From:	Jussi Kivilinna <jussi.kivilinna@...et.fi>
To:	Matt Sealey <matt@...esi-usa.com>
Cc:	Nicolas Pitre <nico@...xnic.net>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-crypto@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Russell King <linux@....linux.org.uk>,
	Linux ARM Kernel ML <linux-arm-kernel@...ts.infradead.org>,
	Dave Martin <dave.martin@...aro.org>,
	David McCullough <david_mccullough@...fee.com>
Subject: Re: [PATCH] crypto: fix FTBFS with ARM SHA1-asm and THUMB2_KERNEL

Quoting Matt Sealey <matt@...esi-usa.com>:

> This question is to the implementor/committer (Dave McCullough), how
> exactly did you measure the benchmark and can we reproduce it on some
> other ARM box?
>
> If it's long and laborious and not so important to test the IPsec
> tunnel use-case, what would be the simplest possible benchmark to see
> if the C vs. assembly version is faster for a particular ARM device? I
> can get hold of pretty much any Cortex-A8 or Cortex-A9 that matters, I
> have access to a Chromebook for A15, and maybe an i.MX27 or i.MX35 and
> a couple Marvell boards (ARMv6) if I set my mind to it... that much
> testing implies we find a pretty concise benchmark though with a
> fairly common kernel version we can spread around (i.MX, OMAP and the
> Chromebook, I can handle, the rest I'm a little wary of bothering to
> spend too much time on). I think that could cover a good swath of
> not-ARMv5 use cases from lower speeds to quad core monsters.. but I
> might stick to i.MX to start with..

There is 'tcrypt' module in crypto/ for quick benchmarking. 'modprobe  
tcrypt mode=500 sec=1' tests AES in various cipher-modes, using  
different buffer sizes and outputs results to kernel log.

-Jussi

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