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

[dave b]

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.

See https://bugzilla.kernel.org/show_bug.cgi?id=18302 for the original thread.
I filed this as bug  18302 at
https://bugzilla.kernel.org/show_bug.cgi?id=18302 .



---------- Forwarded message ----------
From: dave b <db.pub.mail@xxxxxxxxx>
Date: 7 October 2010 04:58
Subject: Re: [dm-crypt] [BUG] bad performance and system stalls when
using dm-crypt
To: Milan Broz <mbroz@xxxxxxxxxx>
Cc: dm-crypt@xxxxxxxx


On 12 September 2010 21:45, dave b <db.pub.mail@xxxxxxxxx> wrote:
> On 12 September 2010 19:07, Milan Broz <mbroz@xxxxxxxxxx> wrote:
>> On 09/12/2010 10:36 AM, dave b wrote:
>>>
>>> Should I forward my 'bug' to the linux kernel maliing list ?
>>
>> Better report it to kernel bugzilla, it is better for tracking.
>> (Also see https://bugzilla.kernel.org/show_bug.cgi?id=17892 )
>
> Will do :)
>

Ok no one has responded to that bug ... :/
On a system lock up I ssh into the box and saw wait time was 83% in top.
I also saw that kcrypd was using 23% of cpu time - and that only one
core was in use.
1012 root   Â20  0   0  Â0  Â0 S  11 Â0.0 Â30:15.46 kcryptd

The system was stalled for 20minutes ...

load average: 19.16, 15.74, 11.43

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Labour's Lost"
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