** Also affects: ubuntu-z-systems
Importance: Undecided
Status: New
** Changed in: ubuntu-z-systems
Status: New => Fix Released
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>From "Comment bridged from LTC Bugzilla" in a bug discussion:
"FWIW, I verified this on z14, and there clearly lz4 is (as expected)
the fastest decompression algorithm.
With vanilla 5.3-rc6 and defconfig I get the following kernel uncompression
times:
lzo: 27us
lz4: 24us
An initrd
Also enable LZ4 for s390x as IBM has provided us with some positive
feedback about using this.
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https://bugs.launchpad.net/bugs/1840934
Title:
Change kernel compression
This bug was fixed in the package linux - 5.2.0-15.16
---
linux (5.2.0-15.16) eoan; urgency=medium
* Packaging resync (LP: #1786013)
- [Packaging] resync getabis
* Change kernel compression method to improve boot speed (LP: #1840934)
- [Packaging] add build dependencies
@Dimitri,
Seems that for initramfs lz4 makes a lot of sense, see:
https://kernel.ubuntu.com/~cking/boot-speed-eoan-5.3/boot-speed-
initramfs-decompression-eoan.ods
The load times for LZ4 is slower than the previous default, however, the
decompression time makes up for this unless one is booting
@Dimitri, so you set the defaults w/o any benchmarking stats?
I'll see if I can get some time to check what the sane options are per-
arch.
Colin
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I don't think Colin collected any data on initramfs compression, but I
subscribed Colin to the bug so he can comment.
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https://bugs.launchpad.net/bugs/1840934
Title:
Should we match these defaults for initramfs too?
At the moment I have switched to lz4 across the board, but maybe it does
make sense to use lzo on s390x and gzip on armhf, etc.
Should I escalate to IBM supporting lz4 on ppc64le?
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** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu)
Status: Incomplete => Fix Committed
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Seth Forshee (sforshee)
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