linux-kernel - Re: [dm-devel] [PATCH] DM-CRYPT: Scale to multiple CPUs

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Message-ID: <20100602052054.GA5918@gondor.apana.org.au>
Date:	Wed, 2 Jun 2010 15:20:54 +1000
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Mikulas Patocka <mpatocka@...hat.com>
Cc:	Andi Kleen <ak@...ux.intel.com>,
	device-mapper development <dm-devel@...hat.com>,
	linux-kernel@...r.kernel.org, agk@...hat.com
Subject: Re: [dm-devel] [PATCH] DM-CRYPT: Scale to multiple CPUs

On Wed, Jun 02, 2010 at 01:15:43AM -0400, Mikulas Patocka wrote:
>
> Almost every CPU is "very slow" so that it lags behind disk when 
> encrypting. CPUs with hardware AES may be the exception.

I would not call a platform like Nehalem the exception.

> If one CPU submits I/O for 10MB of data, your patch makes no 
> paralelization at all. Because all those 10MB will be encrypted by the 
> same CPU that submitted it.

He doesn't need to.  This is already solved by pcrypt.

Cheers,
-- 
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