linux-kernel - Re: dm-crypt: Performance Regression 2.6.37 -> 2.6.38-rc8

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Message-ID: <20110311183654.GA3272@tassilo.jf.intel.com>
Date:	Fri, 11 Mar 2011 10:36:54 -0800
From:	Andi Kleen <ak@...ux.intel.com>
To:	Milan Broz <mbroz@...hat.com>
Cc:	Mario 'BitKoenig' Holbe <Mario.Holbe@...Ilmenau.DE>,
	dm-crypt@...ut.de, linux-kernel@...r.kernel.org,
	Alasdair G Kergon <agk@...hat.com>,
	Herbert Xu <herbert@...dor.apana.org.au>
Subject: Re: dm-crypt: Performance Regression 2.6.37 -> 2.6.38-rc8

On Fri, Mar 11, 2011 at 07:29:58PM +0100, Milan Broz wrote:
> On 03/11/2011 07:03 PM, Mario 'BitKoenig' Holbe wrote:
> 
> >> You probably need to find some way
> >> to make pcrypt (parallel crypt layer) work for dmcrypt. That may
> >> actually give you more speedup too than your old hack because
> >> it can balance over more cores. 
> 
> dmcrypt is already using async crypto interface, it is ready
> for parallelization on this level.
> 
> Perhaps the problem is that pcrypt is not yet implemented for needed
> algorithms?

It needs some glue according to Herbert. I forgot the details.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only
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