linux-kernel - Re: Fwd: [dm-crypt] [BUG] bad performance and system stalls when using dm-crypt

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Message-ID: <4CC45F56.7010305@redhat.com>
Date:	Sun, 24 Oct 2010 18:31:18 +0200
From:	Milan Broz <mbroz@...hat.com>
To:	dave b <db.pub.mail@...il.com>
CC:	Linux Kernel <linux-kernel@...r.kernel.org>,
	device-mapper development <dm-devel@...hat.com>
Subject: Re: Fwd: [dm-crypt] [BUG] bad performance and system stalls when
 using dm-crypt

On 10/24/2010 05:32 PM, dave b wrote:
> I am forwarding this to the linux kernel mailing list to see if anyone
> is actually interested with this bug or not. I suspect that the patch
> to allow DM-CRYPT to use multiple cpus(Scale to multiple CPUs) will
> remove most of the problem but *not* all of it. As I previously was
> triggering the bug on a single core system.

Hi,
sorry for not updating the bug. We know about this.

Fix was expected to be based on top of the Andi's dm-crypt per-cpu
patch but unfortunately I found serious problems there
(see this thread http://lkml.org/lkml/2010/10/20/215 )

So there are now several known situations when dm-crypt doesn't
perform as expected (another problem just appeared when using CFQ,
(because dm(-crypt) lost the issuing process reference)
see http://lkml.org/lkml/2010/10/24/59).

Milan
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