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https://github.com/LiBwrt-op/openwrt-6.x.git
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4bd7990488
zstd with its default settings (compression level -3) compresses better than bzip2 -9 (which is the default setting), and is an order of magnitude faster. I made the following measurements for the most common compression tools (all standard Debian Buster versions, default flags unless noted otherwise), using the debug information of a large x86-64 kernel with ALL_KMODS: * kernel-debug.tar: 376M * kernel-debug.tar.gz: 101M, compressed in ~12s * kernel-debug.tar.bz2: 91M, compressed in ~15s * kernel-debug.tar.xz: 57M, compressed in ~101s * kernel-debug.tar.zst: 86M, compressed in ~1s With zstd, there is still some room for improvement by increasing the compression, but the slight increase in compression ratio (22.83% -> 19.46%) does not justify the significant increase in compression time (about 5 times on my machine) in my opinion. Note that multithreaded compression (-T argument) does not affect reproducibility with zstd. Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net> |
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| device_table.txt | ||
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| hardened-ld-pie.specs | ||
| hardening.mk | ||
| host-build.mk | ||
| image-commands.mk | ||
| image-legacy.mk | ||
| image.mk | ||
| kernel-build.mk | ||
| kernel-defaults.mk | ||
| kernel-version.mk | ||
| kernel.mk | ||
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| unpack.mk | ||
| verbose.mk | ||
| version.mk | ||