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Change #9793

Category None
Changed by Matthias Schiffer <mschifferohnoyoudont@universe-factory.net>
Changed at Sun 31 May 2020 09:03:31
Repository https://git.openwrt.org/openwrt/openwrt.git
Branch master
Revision 4bd7990488b0ca7b5cae16f0a9147a4146759053


build: compress kernel debuginfo using zstd
zstd with its default settings (compression level -3) compresses better
than bzip2 -9 (which is the default setting), and is an order of magnitude

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

* 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>

Changed files