Does the ubuntu 22.04 use the fast installation algorithm, like 20.04?

3088 K

12/7/23, 11:29 AM

Compared to Ubuntu 18.04, it takes less time to install Ubuntu 20.04 due to new compression algorithms.

I wander weather 22.04 still use the same algorithm. I couldn't find any post explaining this.

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Andrew Lowther

12/8/23, 11:47 PM

I believe you are referring to the following line from the 20.04 (Focal) release notes. It indicates lz4 compression is used for the kernel and the initramfs.

Boot speed improvements through changing the default kernel compression algorithm to lz4 (in Ubuntu 19.10) on most architectures, and changing the default initramfs compression algorithm to lz4 on all architectures.

I believe with 22.04 the default kernel compression and initramfs compression were changed to zstd. I have not found anything as obvious as a line in the Jammy Release Notes, but these commands on a stock 22.04 server indicate zstd.

root@ubuntu:~# grep CONFIG_KERNEL_ /boot/config-$(uname -r)
# CONFIG_KERNEL_GZIP is not set
# CONFIG_KERNEL_BZIP2 is not set
# CONFIG_KERNEL_LZMA is not set
# CONFIG_KERNEL_XZ is not set
# CONFIG_KERNEL_LZO is not set
# CONFIG_KERNEL_LZ4 is not set
CONFIG_KERNEL_ZSTD=y

root@ubuntu:~# grep COMPRESS /etc/initramfs-tools/initramfs.conf
# COMPRESS: [ gzip | bzip2 | lz4 | lzma | lzop | xz | zstd ]
COMPRESS=zstd

There is also a bug report (LP: #1931725) where the change and speed impacts were discussed.

These compression options affect boot time and will have very little effect on installation time.

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