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This is a dirty fix for #666974 (which is fixed in Jessie's installer).
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Quoting /usr/share/doc/cryptsetup/README.keyctl :
The current state for dm-crypt in Linux is that it is single threaded, thus
every dm-crypt mapping only uses a single core for crypto operations. To
use the full power of your many-core processor it is thus necessary to
split the dm-crypt device. For Linux software raid arrays the easiest
segmentation is to just put the dm-crypt layer below the software raid
layer.
However, this seems no longer true since 2.6.38, cf.
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=714806
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c029772125594e31eb1a5ad9e0913724ed9891f2
http://kernelnewbies.org/Linux_2_6_38#head-49f5f735853f8cc7c4d89e5c266fe07316b49f4c
Therefore encrypting the array (instead of assembling an array of encrypted
disks) shouldn't cause a performance cost. Also, it makes the ramdisk much
easier to configure :-)
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Tested with the Intel® Desktop Board DH87RL, BIOS [RLH8710H.86A] version
0323.
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To be clearer, and to follow the recommendation of the FSF, we include
a full header rather than a single sentence.
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Move preseed-related stuff in ./preseed/, and vm-related stuff in
./virtualenv/.
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