Re: [PATCH 0/2] Squashfs: add LZ4 compression

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Hi:

squashfs+lz4 / aufs to speed up my laptop
Squashfs proves its usefulness especially in combination
with aufs or overlayfs; I suppose that this combination
will become more popular with the spreading of overlayfs
(e.g. to save disk space etc.)

For users with such a combination, it is especially important
to get a fast (re)compression of huge directories.

The speed of LZ4 for compression in such a setting is really incredible.
Just for orientation for myself, I made a list of times/sizes
on some machines I had access to:

https://github.com/vaeth/squashmount/blob/master/compress.txt

(I do not claim that this is a scientific benchmark - just a
straightforward average over several runs).
The results for the kernel source and libreoffice are really
unbelievable, but I repeated them several times (and,
as you can see, for the kernel sources on different machines).

From the user perspective, it is mainly important that
the files compressed in this way can be read by the kernel -
the decompression speed is here secondary, so I made no comparison
for this case, although lz4 is known to be very fast also
for decompression.

I would really like to see lz4 support included in the
squashfs kernel driver. I cannot imagine any negative consequences,
especially since squashfs and lz4 are in the kernel, anyway.

Sincerely
Martin Väth

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