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

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Date:	Mon, 25 Oct 2010 03:52:41 +1100
From:	dave b <db.pub.mail@...il.com>
To:	Milan Broz <mbroz@...hat.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 25 October 2010 03:31, Milan Broz <mbroz@...hat.com> wrote:
> 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).

Thank for you replying  ^ ^
I was aware with the problems and I am following Andi's dm-crypt
per-cpu patch (I haven't applied or tested it). However, I didn't know
about http://lkml.org/lkml/2010/10/24/59 -->
So this may well be the root of the problem!
Also, won't http://lkml.org/lkml/2010/10/24/59  need to be altered
(again) to work with Andi's patch ?


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