How to revert to old compression method for initramfs? Generating image
with zstd is extremely slow and takes long time on slow CPU.
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This bug was fixed in the package linux-oracle - 5.13.0-1008.10
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linux-oracle (5.13.0-1008.10) impish; urgency=medium
* impish/linux-oracle: 5.13.0-1008.10 -proposed tracker (LP: #1946331)
* Miscellaneous Ubuntu changes
- [Config] update toolchain version in configs after
** Also affects: linux-oracle (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux-oracle (Ubuntu)
Status: New => Fix Committed
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This bug was fixed in the package linux - 5.13.0-14.14
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linux (5.13.0-14.14) impish; urgency=medium
* impish/linux: 5.13.0-14.14 -proposed tracker (LP: #1938565)
* Miscellaneous Ubuntu changes
- SAUCE: Revert "UBUNTU: SAUCE: random: Make getrandom() ready earlier"
-
** Tags added: bot-stop-nagging
** Changed in: ubuntu-z-systems
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1931725
Title:
initramfs-tools &
This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
focal' to 'verification-done-focal'. If the problem still exists, change
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@cborntra
v5.13 ubuntu kernel's s390 configuration with zstd -22 --ultra
compression is 8.5 MB, whereas gzip -9 is 11M.
Thus for gzip to win at bootspeed the decompression speed has to
compensate for 2.5M of i/o and be faster than zstd.
Unaccelerated decompression comparison still gives me
decompression speed only needs to be faster than i/o speed, once that is
reached the best compression ratio results in the fastest bootspped.
for kernel image zstd is used with -22 --ultra, thus I can compare it
with zlib -9.
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** Tags added: architecture-s39064 bugnameltc-193300 severity-high
targetmilestone-inin2004
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https://bugs.launchpad.net/bugs/1931725
Title:
initramfs-tools & kernel: use
Vasily Gorbik is reviewing this patch.
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https://bugs.launchpad.net/bugs/1931725
Title:
initramfs-tools & kernel: use zstd as the default compression method
Status in
** Also affects: ubuntu-z-systems
Importance: Undecided
Status: New
** Changed in: ubuntu-z-systems
Assignee: (unassigned) => bugproxy (bugproxy)
** Tags added: reverse-proxy-bugzilla s390x
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@ IBM can you please review the upstream patch and merge it into the the
s390 tree ?
https://lore.kernel.org/linux-s390/20210615114150.325080-1-dimitri.led...@canonical.com/T/#u
** Description changed:
Turns out that loading is always the slow part in loading initramfs into
memory and
** Summary changed:
- initramfs-tools: use zstd as the default compression method
+ initramfs-tools & kernel: use zstd as the default compression method
** Description changed:
Turns out that loading is always the slow part in loading initramfs into
memory and decompressing it since
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