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

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Message-ID: <4CC46773.2000606@redhat.com>
Date:	Sun, 24 Oct 2010 19:05:55 +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 06:52 PM, dave b wrote:
>> 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 ?

CFQ related problem should be solved - probably device-mapper core
have to provide some help. (It is not only about dm-crypt,
lot of situations when IO is submitted from different internal process.
The proposed patch is not the proper and complete way how to solve it.)

For the per-cpu patch - I am waiting for replay, apparently some
additional work there is needed.
But I would like to solve it ASAP.

Milan
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