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Re: [dm-devel] device mapper integrated loops - and one more year !

2006/10/10, Heinz Mauelshagen <mauelshagen redhat com>:
On Mon, Oct 09, 2006 at 05:36:40PM -0500, Jonathan E Brassow wrote:
> On Oct 6, 2006, at 4:38 AM, David Guyon Martin wrote:
> >On Thu, 5 Oct 2006 20:40:05 +0100 Alasdair G Kergon wrote:
> >
> >>Something like:
> >>
> >>http://www.kernel.org/pub/linux/kernel/people/agk/patches/2.6/
> >>editing/dm-loop.patch
> >>now perhaps?
> >
> >>(And there are patches for dmsetup to become a drop-in losetup
> >>replacement.)
> >
> >Yes! This patch add a new file to the kernel tree, dm-loop.c:
> >"This implements a loopback target for device mapper allowing a regular
> >file to be treated as a block device."
> >
> >Great !!! At last :)
> >It seems this dm-loop is quite new, less than a month...
> >As I understand it I need kernel 2.6.18-rc7 to use it, right ?
> >
> >I really thank you a lot for your quick answer and link.
> >
> >Does anyone has yet a feedback about this dm-loop ?
> >
> I know Heinz Mauelshagen has been looking at it and already has some
> performance improvements.  Perhaps he'll post the updated patches soon.

Yes, I'm settling the changes, which optimize the linear search
in the file extents table and the initial lookup of the extents
in the file to create the table with the dm-loop author Bryn Reeves
right now.

First benchmarks show promissing results :-)

We hope to post something shortly.

Heinz    -- The LVM Guy --

Thanks a lot ! I stay tuned ( I can hardly wait the results ).
I think many sysadmins underestimate the power of loops, more loops
and greater performances will ease eyes opening.

From dm-loop, comes dm-stego. I didn't found anything similar in the dev tree.
Does anyone know if someone is working on a dm-stego filter ?

David G.M.

PS: Heinz, since you've written dm-delay, you may have a clue to

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