A look at compression algorithms on the topic of Quill filesystems

Those are algorithms available on Quill ( probably )

lz4 is too weak so i didn't cared at all

compression	size
gzip, 128K	69M
lzo, 128K	76M
xz, 128K	59M
gzip, 1048576	69M
lzo, 1048576	75M
xz, 1048576	54M

xz is the winner, so now:

56M ../out/rootfs-xz-1M-25p.squashfs  
55M ../out/rootfs-xz-1M-50p.squashfs  
54M ../out/rootfs-xz-1M-75p.squashfs
54M ../out/rootfs-xz-1M-100p.squashfs

nothing changed... maybe decompression speed?

averages, kindof:

100% - 1,70s

75% - 1,70s

50% - 1,70s

25% - 1,73s?

I'm wasting my time.

gzip is 0.50s

well, conclusions:

• nicolas has choosen the compression and block size wisely
• I wasted my time a bit
• use xz for max space, use gzip to be a bit faster ( if you fit it ) and no compression for the speed

In xz there is also:

-Xbcj filter1,filter2,...,filterN
    Compress using filter1,filter2,...,filterN in turn (in addition to no filter), and choose the best compression. Available filters: x86, arm, armthumb, powerpc, sparc, ia64. 

It doesn't do anything in Quill, at least for small archive that I have tested it against