[dm-devel] Re: 2.6.24 Kernel Soft Lock Up with heavy I/O in dm-crypt

[Ritesh Raj Sarraf]

Following is the bugzilla that was opened against this problem.
http://bugzilla.kernel.org/show_bug.cgi?id=10378

Since I wasn't able to reproduce it on a server machine again, it was later
closed.

If you think it is the same issue, please feel free to re-open it.


Ritesh

On Mon, Jun 2, 2008 at 6:01 PM, Yan Li <elliot.li.tech at gmail.com> wrote:

> Hi Milan,
>
> On Mon, Jun 02, 2008 at 08:52:00AM +0200, Milan Broz wrote:
> > Please could you try if  patch here helps and doesn't cause performance
> degradation?
> >
> http://www2.kernel.org/pub/linux/kernel/people/agk/patches/2.6/2.6.25/dm-crypt-add-cond_resched.patch
>
> Will the result of testing a Debian 2.6.24-etchnhalf.1-amd64 kernel
> (very near a vanilla kernel) be of same value?  Since the data on some
> other drives on this server is important so I dare not try 2.6.25-rc
> on it.
>
> Following is my test plan, comments are welcomed:
>
> Test command:
> # dd if=/dev/zero of=/dev/mapper/open_device bs=500M count=10
> (this server has 2G memory)
>
> The command will be run for 3 times, and average speed of last two
> runs will be taken as result score.
>
> Dm-crypt LUKS Encryption scenarios:
> aes-cbc-essiv:sha256, keysize 128
> aes-xts-plain, keysize 256
> aes-xts-plain, keysize 512
>
> I will compare the speed of all above 3 encryption scenarios, with and
> without the patch.
>
> --
> Li, Yan
>



-- 
Ritesh Raj Sarraf
RESEARCHUT - http://www.researchut.com
"Necessity is the mother of invention."
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