Supporting LZ4 as initramfs compressor

[Seth Arnold]

On Thu, May 30, 2019 at 11:46:57AM +0100, Dimitri John Ledkov wrote:
> As if lz4 kernel & xz initrd would yield the fastest boot time? That

I'm lacking some context here, but I think building the initrds is already
too slow and I'm afraid xz on initrd rebuilds would be significantly
worse than lz4 or zstd or even low-compression levels of zlib.

Boot times are important but every now and then people do run apt upgrade
by hand and waiting forever to rebuild an initrd that may or may not be
used is pretty tedious. xz is great if the really slow compress times will
be made up for by better transfers or disk savings or similar.

Thanks
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