On Tue, 2018-02-13 at 10:52 +0100, Igor Gnatenko wrote: > What about zstd? Also in latest version of lz4 there is support for > dictionaries too. So I've investigated zstd, and, here are my results: Latest F27 primary.gz - 3.1MB zlib zchunk (including custom dict) primary.zck - 4.2MB ~35% increase zstd zchunk (including dict generated from last three Fedora GA primaries) primary.zck - 3.7MB ~20% increase Using zstd for filelists.xml has roughly the same increase as with zlib, which is expected as the chunks are larger and thus get better compression even without a dict. I did also look briefly at lz4, but it seems that it's major advantage is speed, and I'm not sure that metadata decompression speed is our main bottleneck in dnf. With these numbers, I think it makes sense to move forward with zstd instead of zlib. Jonathan
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