Rsync compression

Considering the limitations of typical devices which run OpenWrt, it would be nice if rsync supported more compression options when additional libraries are installed, such as kmod-lib-lz4.

I find lz4 to be faster overall than the zlib compression which is the only supported compression on OpenWrt rsync package (as determined by rsync --version output). More powerful devices might make better use with zstd.

References:

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A PR was recently merged to support more. Try running a snapshot build until the commit is back ported.

EDIT: https://github.com/openwrt/packages/pull/23928

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growing rsync size will make it offlimit for most devices.
links are not relevant to rsync at all

That's awesome! And I didn't even know about xxhash to speed it up.

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