dm-loop (for qole) - maemo.org

Matan | # 1 | 2008-09-26, 12:37 | Report

These two modules enable dm-loop:

http://my.arava.co.il/~matan/770/dm-mod.ko
http://my.arava.co.il/~matan/770/dm-loop.ko

To use it you need dmsetup package which is available from debfarm repository. After installing the package add a symlink from dmlosetup to dmsetup, and run something like:

dmlosetup 0 /z/debian.img

Then mount /dev/dm-0 /opt

In my (very unscientific) tests it is about 4 times faster than loop, and very close to direct access speed.

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qole | # 2 | 2008-09-26, 19:49 | Report

Matan,

you rock.

qole | # 3 | 2008-09-27, 05:16 | Report

Originally Posted by Matan View Post

....run something like:

dmlosetup 0 /z/debian.img

Just a slight correction, the 0 is wrong, it should be loop0 instead:

Code:

dmlosetup loop0 /media/mmc1/debian.img

Originally Posted by Matan View Post

In my (very unscientific) tests it is about 4 times faster than loop, and very close to direct access speed.

OpenOffice loads at least 2x as fast, which is a huge improvement.

Thanks so much! I've already incorporated the Matan TurboLoop (c) into my next version of Easy Debian...

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Stskeeps | # 4 | 2008-10-02, 08:56 | Report

Matan: Can I probe what patch you used for the 2.6.21 kernel to get this compiled?, as it's not part of the 2.6.21 kernel by default. Reason is that I would like to compile some .o's that would follow kernel updates for Deblet.

Your work is immensely useful both for qole's Easy Debian and for my "Deblet-in-a-file" (I've just managed to compile dmsetup.static, may be interesting as well for qole), where I make a Deblet system boot entirely from a file on a vfat partition.

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Matan | # 5 | 2008-10-02, 11:15 | Report

I'm using iodine in an airport, so I won't include a link, but dm-loop project has patches for 2.6.20 which apply cleanly to 2.6.21-omap1.

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qole | # 6 | 2008-10-02, 16:22 | Report

Originally Posted by Matan View Post

I'm using iodine in an airport...

Yikes. Now there's a man who likes his free wi-fi, no matter how slow.

Stskeeps | # 7 | 2008-10-04, 16:17 | Report

Deblet-in-a-file now also uses dm-loop

thanks for the great work Matan.

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qole | # 8 | 2009-06-17, 04:19 | Report

Matan: Do you think you could build these modules for the Maemo 5 kernel?

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Matan | # 9 | 2009-06-17, 08:49 | Report

I am usually not interested in software without hardware to run on, so I do not expect to install Maemo 5 SDK until (and if) a Maemo 5 tablet is available.

There are patches that should apply to modern kernel, see here:

http://osdir.com/ml/linux.kernel.dev.../msg00038.html

I believe that anyone who has the SDK installed can easily patch and compile the kernel.

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qole | # 10 | 2009-06-17, 15:50 | Report

I discovered last night that the lack of a dm-loop in Fremantle is the least of my problems. I am finding it very difficult to test my Easy Debian scripts in the SDK when there's not even a "mount" command...