Matan is offline Matan
09-26-2008 , 09:37 AM
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#1
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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09-26-2008 , 04:49 PM
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#2
Matan,

you rock.
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09-27-2008 , 02:16 AM
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#3
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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10-02-2008 , 05:56 AM
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#4
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 is offline Matan
10-02-2008 , 08:15 AM
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#5
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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10-02-2008 , 01:22 PM
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#6
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.
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10-04-2008 , 01:17 PM
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#7
Deblet-in-a-file now also uses dm-loop thanks for the great work Matan.
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06-17-2009 , 01:19 AM
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#8
Matan: Do you think you could build these modules for the Maemo 5 kernel?
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Matan is offline Matan
06-17-2009 , 05:49 AM
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#9
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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06-17-2009 , 12:50 PM
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#10
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...
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