linux-kernel - Re: [PATCH 0/2] crypto: add new driver for Marvell CESA

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Message-ID: <20150429094902.GC9874@gondor.apana.org.au>
Date:	Wed, 29 Apr 2015 17:49:02 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Boris Brezillon <boris.brezillon@...e-electrons.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	linux-crypto@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>, devicetree@...r.kernel.org,
	Tawfik Bayouk <tawfik@...vell.com>,
	Lior Amsalem <alior@...vell.com>,
	Nadav Haklai <nadavh@...vell.com>,
	Eran Ben-Avi <benavi@...vell.com>,
	Thomas Petazzoni <info@...e-electrons.com>,
	Gregory CLEMENT <gregory.clement@...e-electrons.com>,
	Jason Cooper <jason@...edaemon.net>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	Andrew Lunn <andrew@...n.ch>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Arnaud Ebalard <arno@...isbad.org>
Subject: Re: [PATCH 0/2] crypto: add new driver for Marvell CESA

On Tue, Apr 28, 2015 at 09:52:32PM +0200, Boris Brezillon wrote:
> 
> In particular, I'd like to discuss the threaded-irq approach taken in
> this driver (other drivers are using tasklets).
> The main reason behind this choice is the fact that crypto engines
> are quite fast, and I'm worried about the CPU contention that might
> happen in case of fully loaded crypto engines (the CPU might spend most
> of its time in interrupt context until the crypto queue is emptied).
> Using threaded-irq allows preemption of the crypto completion
> operation, thus authorizing another thread (with higher priority) to be
> scheduled. ITOH, the tasklet approach provide slightly performances (I
> don't recall the exact numbers, but Arnaud did some tests).

Either approach is fine with me.

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