Bug#989143: initramfs-tools: doesn’t actually compress with zstd
On Sat, 2021-06-05 at 16:59 +0200, Ben Hutchings wrote: > You mean, can the main initramfs be uncompressed? I'm not sure > whether > the kernel supports that. It's certainly not an option in initramfs- > tools at the moment. Forget it... I'm stupid ^^ ... it's just the microcode, that's uncompressed, while the rest is. Thanks, Chris.
Bug#989143: initramfs-tools: doesn’t actually compress with zstd
On Sat, 2021-06-05 at 16:49 +0200, Christoph Anton Mitterer wrote: > On Sat, 2021-06-05 at 16:23 +0200, Ben Hutchings wrote: > > You have intel-microcode installed, which prepends an uncompressed > > initramfs. Not a bug. > > Couldn't it then just skip the compression altogether? You mean, can the main initramfs be uncompressed? I'm not sure whether the kernel supports that. It's certainly not an option in initramfs- tools at the moment. Ben. -- Ben Hutchings Kids! Bringing about Armageddon can be dangerous. Do not attempt it in your own home. - Terry Pratchett and Neil Gaiman, `Good Omens' signature.asc Description: This is a digitally signed message part
Bug#989143: initramfs-tools: doesn’t actually compress with zstd
On Sat, 2021-06-05 at 16:23 +0200, Ben Hutchings wrote: > You have intel-microcode installed, which prepends an uncompressed > initramfs. Not a bug. Couldn't it then just skip the compression altogether? Cheers, Chris.
Bug#989143: initramfs-tools: doesn’t actually compress with zstd
Control: tags -1 - moreinfo On Mon, 2021-05-31 at 11:08 +0200, Nicolas Schier wrote: > To validate my argumentation, > please set 'COMPRESS=gzip' in '/etc/initramfs-tools/initramfs.conf', > run 'update-initramfs -u' again and compare the sizes of the > (probably) > zstd-compressed one with the gzip-compressed one. That gives: With zstd: # file initrd* initrd.img-5.10.0-7-amd64: ASCII cpio archive (SVR4 with no CRC) # l initrd* -rw-r--r-- 1 root root 26M May 30 06:21 initrd.img-5.10.0-7-amd64 Changing to gzip: # update-initramfs -u ... # file initrd* initrd.img-5.10.0-7-amd64: ASCII cpio archive (SVR4 with no CRC) # l initrd* -rw-r--r-- 1 root root 33M May 31 15:54 initrd.img-5.10.0-7-amd64 Cheers, Chris.
Bug#989143: initramfs-tools: doesn’t actually compress with zstd
Control: tags -1 + moreinfo Hi Christoph, > Just noted by coincidence, that even though I have set: > COMPRESS=zstd > and zstd is installed and even runs (seen in e.g. top utility) when running > update-initramfs -u > the files are in the end nevertheless plain cpio: > file /boot/initrd.img-5.10.0-7-amd64 > /boot/initrd.img-5.10.0-7-amd64: ASCII cpio archive (SVR4 with no CRC) I can see the same behaviour on my amd64 machine, but on my arm64 system 'file' identifies the initramfs images as zstd archives: /boot/initrd.img-5.10.0-6-arm64: Zstandard compressed data (v0.8+), Dictionary ID: None According to the last lines of /usr/sbin/mkinitramfs, there seems to be a non-compressed cpio at the top of your amd64's initrd.img which is followed by the zstd-compressed one. To validate my argumentation, please set 'COMPRESS=gzip' in '/etc/initramfs-tools/initramfs.conf', run 'update-initramfs -u' again and compare the sizes of the (probably) zstd-compressed one with the gzip-compressed one. On my amd64 machine, it looks like this: $ file initrd-*/* initrd-gzip-compressed/initrd.img-5.10.0-6-amd64: ASCII cpio archive (SVR4 with no CRC) initrd-zstd-compressed/initrd.img-5.10.0-6-amd64: ASCII cpio archive (SVR4 with no CRC) $ ls -hs initrd-*/* 36M initrd-gzip-compressed/initrd.img-5.10.0-6-amd64 28M initrd-zstd-compressed/initrd.img-5.10.0-6-amd64 . Kind regards, Nicolas PS: Does anyone know, how to extract the second (aka compressed) cpio archive from the combined initrd.img?
Bug#989143: initramfs-tools: doesn’t actually compress with zstd
Package: initramfs-tools Version: 0.140 Severity: normal Hey. Just noted by coincidence, that even though I have set: COMPRESS=zstd and zstd is installed and even runs (seen in e.g. top utility) when running update-initramfs -u the files are in the end nevertheless plain cpio: file /boot/initrd.img-5.10.0-7-amd64 /boot/initrd.img-5.10.0-7-amd64: ASCII cpio archive (SVR4 with no CRC) Cheers, Chris. -- Package-specific info: -- initramfs sizes -rw-r--r-- 1 root root 24M May 14 13:47 /boot/initrd.img-5.10.0-6-amd64 -rw-r--r-- 1 root root 24M May 26 19:21 /boot/initrd.img-5.10.0-7-amd64 -- /proc/cmdline BOOT_IMAGE=/vmlinuz-5.10.0-7-amd64 root=/dev/mapper/system ro rootflags=subvol=root random.trust_cpu=off luks.crypttab=no -- /proc/filesystems btrfs fuseblk -- /etc/initramfs-tools/modules usb-storage xhci-hcd xhci-pci ehci-hcd ehci-pci uhci-hcd btrfs -- /etc/initramfs-tools/initramfs.conf MODULES=dep BUSYBOX=auto KEYMAP=n COMPRESS=zstd DEVICE= NFSROOT=auto RUNSIZE=10% FSTYPE=auto -- /etc/initramfs-tools/update-initramfs.conf update_initramfs=yes backup_initramfs=no -- /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] unused devices: -- /sys/block dm-0 loop0 loop1 loop2 loop3 loop4 loop5 loop6 loop7 sda /usr/share/initramfs-tools/hooks: btrfs cryptgnupg cryptgnupg-sc cryptkeyctl cryptopensc cryptpassdev cryptroot cryptroot-unlock dmsetup fsck fuse intel_microcode keymap klibc-utils kmod lvm2 mdadm nbd ntfs_3g reiserfsprogs resume thermal thin-provisioning-tools udev v86d xfs zz-busybox -- System Information: Debian Release: 11.0 APT prefers unstable-debug APT policy: (500, 'unstable-debug'), (500, 'unstable') Architecture: amd64 (x86_64) Kernel: Linux 5.10.0-7-amd64 (SMP w/4 CPU threads) Kernel taint flags: TAINT_WARN Locale: LANG=en_DE.UTF-8, LC_CTYPE=en_DE.UTF-8 (charmap=UTF-8), LANGUAGE not set Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system) Versions of packages initramfs-tools depends on: ii initramfs-tools-core 0.140 ii linux-base4.6 initramfs-tools recommends no packages. Versions of packages initramfs-tools suggests: ii bash-completion 1:2.11-2 -- no debconf information
