** 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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https://bugs.launchpad.net/bugs/1840934
Title:
Change kernel compression method to improve boot speed
Status in linux package in Ubuntu:
Fix Committed
Bug description:
Colin King has done some analysis of kernel boot speed using different
kernel compression methods. Results for x86 are at:
https://kernel.ubuntu.com/~cking/boot-speed-eoan-5.3/kernel-compression-method.txt
https://kernel.ubuntu.com/~cking/boot-speed-eoan-5.3/boot-speed-compression-5.3-rc4.ods
Testing of s390 gave the following:
GZIP 31528972
LZ4 192348049
LZO 85990145
From Colin: "I used the monotonic TOD timer using the stckf opcode to
fetch a 64 bit time value. Not sure how this maps to 'real time' in
seconds."
Conclusion: We should switch x86 to LZ4 and s390 to LZO. PPC and ARM
do not support LZO or LZ4, so we will stick with gzip there.
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