Public bug reported: 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. ** Affects: linux (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1840934 Title: Change kernel compression method to improve boot speed Status in linux package in Ubuntu: New 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1840934/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
