openwrt/include
Matthias Schiffer 4bd7990488
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
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>
2020-05-31 11:03:31 +02:00
..
site Revert faulty tree push 2019-08-12 12:27:06 +02:00
autotools.mk autotools.mk: autoreconf: fix missing install-sh 2019-07-26 08:09:16 +02:00
cmake.mk cmake: Install host packages to lib instead of lib64 2019-12-23 00:22:07 +01:00
debug.mk include: remove trailing whitespaces 2015-03-29 07:29:18 +00:00
depends.mk build: add missing wildcard for ignoring .pkgdir in dependency checks 2017-02-05 22:17:30 +01:00
device_table.txt image: ensure that /dev/console exist in rootfs images 2013-08-27 12:02:58 +00:00
download.mk build: add zstd support to pack/unpack functions 2020-05-31 11:03:30 +02:00
feeds.mk build: suppress error output in feeds.mk 2019-03-22 00:40:29 +01:00
hardened-ld-pie.specs build: add hardened builds with PIE (ASLR) support 2018-01-27 16:46:45 +01:00
hardening.mk buildsystem: Make PIE ASLR option tristate 2020-01-13 15:34:36 +01:00
host-build.mk build: call Host/Uninstall before wiping the host build dir 2019-10-21 14:18:17 +02:00
image-commands.mk build: image: set default parameter for check-size 2020-03-21 19:59:08 +01:00
image-legacy.mk image: fix ar71xx legacy images 2017-07-15 07:02:59 +02:00
image.mk treewide: convert sed -r to posix -E 2020-04-04 11:28:15 +01:00
kernel-build.mk build: compress kernel debuginfo using zstd 2020-05-31 11:03:31 +02:00
kernel-defaults.mk kernel-defaults: ensure SOURCE_DATE_EPOCH on /init 2019-10-02 17:11:44 +02:00
kernel-version.mk kernel: bump 5.4 to 5.4.42 2020-05-20 15:26:22 +02:00
kernel.mk build: move symvers files to kernel build dir 2020-04-09 09:54:02 +02:00
netfilter.mk kernel: netfilter.mk: fix kmod-ipt-nat6 installation on 5.4 2020-04-20 15:07:17 +02:00
nls.mk treewide: fix build depends to refer to source package names 2018-01-13 19:54:44 +01:00
package-bin.mk build: use if-then to avoid non-zero return codes in bin/ packaging code 2017-01-23 13:49:45 +01:00
package-defaults.mk include/package-defaults.mk: fix default Build/Prepare with empty ./src 2018-03-07 09:59:08 +01:00
package-dumpinfo.mk build: expose ABI version in .packageauxvars 2019-01-19 14:32:01 +01:00
package-ipkg.mk buildsystem: add CPE information to ipkg packages and manifest files 2020-05-05 22:07:59 +02:00
package-seccomp.mk include: add a seccomp filter install wrapper 2015-03-26 10:57:56 +00:00
package.mk build: Remove STAGING_DIR_HOST references for InstallDev/UninstallDev 2020-03-01 21:35:59 +01:00
prereq-build.mk build: prereq: change minimum make version to 3.82 2020-04-29 14:26:23 +01:00
prereq.mk build: cleanup possibly dangling Python 2 host symlink 2019-07-26 08:09:16 +02:00
quilt.mk build: Use LINUX_DIR for Kernel/Patch 2019-01-30 13:20:14 +01:00
rootfs.mk rootfs.mk: ensure all timestamp are set to SOURCE_DATE_EPOCH 2019-09-21 03:26:38 +02:00
scan.awk build: propagate override information to .packageinfo 2015-02-09 12:09:31 +00:00
scan.mk build: have scripts/feeds honor all toplevel .mk-files of a feed 2019-10-27 14:32:13 +01:00
shell.sh build: use mkhash to replace various quirky md5sum/openssl calls 2017-01-05 11:09:12 +01:00
subdir.mk build: remove GNU time dependency 2018-08-05 00:06:27 +02:00
target.mk kernel: remove further obsolete kernel version switches 2020-01-18 19:39:05 +01:00
toolchain-build.mk toolchain: Include hardening.mk for toolchain build 2019-01-24 21:52:39 +01:00
toplevel.mk build: add option to treat recursive deps as error 2020-05-20 17:03:45 +02:00
u-boot.mk u-boot.mk: switch download to https 2020-04-26 21:20:47 +02:00
uclibc++.mk libcxx: Add package 2019-12-23 00:22:07 +01:00
unpack.mk build: add zstd support to pack/unpack functions 2020-05-31 11:03:30 +02:00
verbose.mk include/verbose.mk: Add sc to failure message 2018-07-30 10:43:36 +02:00
version.mk version.mk: use https:// instead of http:// 2019-06-11 01:49:44 +02:00