This is because fsck.ext3 takes several minutes to recover the
journal, whereas the ext3 implementation in the kernel only takes a
few seconds. I'd love to know why this is the case...
svn path=/nixos/branches/modular-nixos/; revision=15965
size of the i686-linux ISO image from 463 MiB to 147 MiB. Hopefully
it also speeds up installation due to reduced seek time and larger
block sizes, but I haven't tested that yet (on real hardware).
svn path=/nixos/branches/modular-nixos/; revision=15930