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author Eric Hameleers <alien@slackware.com>2018-09-01 12:45:59 +0200
committer Eric Hameleers <alien@slackware.com>2018-09-01 12:45:59 +0200
commit8d4c6bc6cf9cd29fd93af1e5ec861e9f290a5877 (patch)
tree478ec77412fa4f3992fe75b3fc6bd9d151e12d6d /xdm/slackware_traditional_black.svg
parentc217def230b135c62718961fb34aee4baf439caf (diff)
downloadliveslak-8d4c6bc6cf9cd29fd93af1e5ec861e9f290a5877.tar.gz
liveslak-8d4c6bc6cf9cd29fd93af1e5ec861e9f290a5877.tar.xz
Finish the zstd compression implementation in liveslak
The new zstd compression support for squashfs modules allows for a much snappier system because zstd decompression is 5 times faster than that of xz (see https://sourceforge.net/p/squashfs/mailman/message/35989805/), but at the expense of ISO sizes that are at least 10% bigger. The latter means that we have to do some more pruning of the XFCE and PLASMA5 images to make these fit in a CDROM and DVD image, respectively. Here are some initial benchmarks with PLASMA5 Live ISO images, booting in QEMU (times are in minutes:seconds): Stage ZSTD XZ --------------------------------------- Boot to runlevel 4 start 0:39 0:50 SDDM Login Manager visible 0:55 1:26 Plasma5 desktop ready 1:42 3:17 I also tested two of the bigger applications, measuring the time between entering the command in a terminal and having a usable application window: Stage ZSTD XZ ---------------------------------------- LO Writer window visible 0:17 0:34 Chromium window visible 0:09 0:14 It is obvious that a big Desktop Environment like Plasma5 where a lot of binaries have to be loaded from their squashfs modules benefits a lot from zstd, because after booting, the Plasma5 DE is available in roughly 53% of the time it takes when using xz compression. Zstd support in squashfs was added to Linux kernel 4.14. That means, no customimzation of Slackware is required to make the Live OS work from zstd-compressed squashfs modules. In order to *create* these zstd-compressed squashfs modules, you will need some custom packages at the moment, until they get added to Slackware-current: zstd and a rebuild squashfs-tools to add the lacking zstd support to mksqhashfs/unsquashfs.
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