linux-kernel - Re: [PATCH 0/2] Introduce the request handling for dm-crypt

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Message-ID: <20151112100422.GM12392@sirena.org.uk>
Date:	Thu, 12 Nov 2015 10:04:22 +0000
From:	Mark Brown <broonie@...nel.org>
To:	Baolin Wang <baolin.wang@...aro.org>
Cc:	Mike Snitzer <snitzer@...hat.com>, axboe@...nel.dk,
	Alasdair G Kergon <agk@...hat.com>, dm-devel@...hat.com,
	neilb@...e.com, linux-raid@...r.kernel.org, jack@...e.cz,
	Arnd Bergmann <arnd@...db.de>,
	LKML <linux-kernel@...r.kernel.org>, keith.busch@...el.com,
	jmoyer@...hat.com, tj@...nel.org, bart.vanassche@...disk.com,
	"Garg, Dinesh" <dineshg@...cinc.com>
Subject: Re: [PATCH 0/2] Introduce the request handling for dm-crypt

On Thu, Nov 12, 2015 at 04:20:41PM +0800, Baolin Wang wrote:

> 3. perforamence data
> It is just a simple dd test result, and will provide the formal report
> in future. But from the simple test, we can see the improvement.

It's probably also worth pointing out that Qualcomm have been shipping
an out of tree implementation of this as a separate module in their BSP
(originally written by Danesh Garg who's on this thread):

   https://android.googlesource.com/kernel/msm/+/android-msm-dory-3.10-kitkat-wear/drivers/md/dm-req-crypt.c

Android now wants to encrypt phones and tablets by default and have been
seeing substantial performance hits as a result, we can try to get
people to share performance data from productionish systems but it might
be difficult.

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