linux-kernel - Re: [PATCH] DM-CRYPT: Scale to multiple CPUs v3 on 2.6.37-rc* ?

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Message-ID: <4CD71C8B.1050604@redhat.com>
Date:	Sun, 07 Nov 2010 22:39:23 +0100
From:	Milan Broz <mbroz@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Matt <jackdachef@...il.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	dm-devel@...hat.com, htd@...cy-poultry.org
Subject: Re: [PATCH] DM-CRYPT: Scale to multiple CPUs v3 on 2.6.37-rc* ?

On 11/07/2010 08:45 PM, Andi Kleen wrote:
>> I read about barrier-problems and data getting to the partition when
>> using dm-crypt and several layers so I don't know if that could be
>> related
> 
> Barriers seem to be totally broken on dm-crypt currently.

Can you explain it?

Barriers/flush change should work, if it is broken, it is not only dm-crypt.
(dm-crypt simply relies on dm-core implementation, when barrier/flush
request come to dmcrypt, all previous IO must be already finished).

Milan
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