Hello Viraniac, or anyone else affected, Accepted cloud-initramfs-tools into noble-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/cloud-initramfs-tools/0.49~24.04.1 in a few hours, and then in the -proposed repository.
Please help us by testing this new package. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users. If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, what testing has been performed on the package and change the tag from verification-needed- noble to verification-done-noble. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification- failed-noble. In either case, without details of your testing we will not be able to proceed. Further information regarding the verification process can be found at https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in advance for helping! N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days. ** Changed in: cloud-initramfs-tools (Ubuntu Noble) Status: New => Fix Committed ** Tags removed: verification-done-noble ** Tags added: verification-needed-noble -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to lvm2 in Ubuntu. https://bugs.launchpad.net/bugs/2065180 Title: performance regression in dracut-install 060 Status in Dracut: New Status in cloud-initramfs-tools package in Ubuntu: Fix Released Status in cryptsetup package in Ubuntu: Fix Released Status in dracut package in Ubuntu: Fix Released Status in initramfs-tools package in Ubuntu: Fix Released Status in lvm2 package in Ubuntu: Fix Released Status in miniramfs package in Ubuntu: Fix Released Status in open-iscsi package in Ubuntu: Invalid Status in thin-provisioning-tools package in Ubuntu: Fix Released Status in cloud-initramfs-tools source package in Noble: Fix Committed Status in cryptsetup source package in Noble: Fix Committed Status in dracut source package in Noble: Fix Released Status in initramfs-tools source package in Noble: Fix Committed Status in lvm2 source package in Noble: Fix Committed Status in miniramfs source package in Noble: New Status in open-iscsi source package in Noble: Fix Released Status in thin-provisioning-tools source package in Noble: Fix Released Bug description: [ Impact ] When compared to Ubuntu 23.10, creating intramfs files with update- initramfs takes 2 to 5 times more time on ARM devices. IIUC, dracut-install usage was added to initramfs-tools to speed up the process. But now its way slower. Even running update-initramfs on jammy, which doesn't use dracut-install, is way faster then the time taken on Noble. first bad commit - https://github.com/dracutdevs/dracut/commit/3de4c7313260fb600507c9b87f780390b874c870 Updating the initrd on a Raspberry Pi Zero 2W on Ubuntu 24.04 (noble) with initramfs-tools 0.142ubuntu25.1 takes over six minutes: ``` bdrung@zero2w:~$ sudo hyperfine --warmup 1 -r 10 "update-initramfs -u" Benchmark 1: update-initramfs -u Time (mean ± σ): 402.751 s ± 5.592 s [User: 166.316 s, System: 228.909 s] Range (min … max): 394.380 s … 411.445 s 10 runs ``` [ Test Plan ] 1. Measure `update-initramfs -u` before the update. 2. Log the content of the initrd before the update: `lsinitramfs /boot/initrd.img` 3. update dracut-install / initramfs-tools-core 4. Measure `update-initramfs -u`. It should be faster (the performance improvements on amd64 should be very small and might be within the measurement uncertainty). 5. Check with lsinitramfs that the content of the newly generated initrd hasn't changed. [ Where problems could occur ] The code that is responsible for including the kernel modules into the initrd is touched. Negative consequences could be that some needed kernel modules will not be included any more (should be covered by the test case) or that building new initrds will fail. The initramfs-tools fix changes how manual_add_modules behaves. `manual_add_modules` does not copy kernel modules, but queues them for being copied when the newly added function `apply_add_modules` is called. I checked all instances of calls to `manual_add_modules` for possible regressions (see comment #15). Only miniramfs needs to be adjusted to also call `apply_add_modules`. But this change could break consumers of the `manual_add_modules` function that are outside of the Ubuntu archive. I googled for `apply_add_modules` but found no public outside users. [ Benchmarks ] Stock noble on a Raspberry Pi Zero 2W: ``` bdrung@zero2w:~$ sudo hyperfine -r 5 "update-initramfs -u" Benchmark 1: update-initramfs -u Time (mean ± σ): 415.664 s ± 6.015 s [User: 166.728 s, System: 232.523 s] Range (min … max): 409.139 s … 422.632 s 5 runs ``` noble with dracut-install 060+5-1ubuntu3.1 (with linux 6.8.0-1006.6 on 2024-07-01): ``` bdrung@zero2w:~$ sudo hyperfine --warmup 1 -r 10 "update-initramfs -u" Benchmark 1: update-initramfs -u Time (mean ± σ): 248.054 s ± 5.569 s [User: 67.410 s, System: 169.412 s] Range (min … max): 238.909 s … 257.384 s 10 runs ``` noble with dracut-install 060+5-1ubuntu3.2 (with linux 6.8.0-1007 on 2024-07-11): ``` bdrung@zero2w:~$ sudo hyperfine --warmup 1 -r 10 "update-initramfs -u" Benchmark 1: update-initramfs -u Time (mean ± σ): 232.001 s ± 5.678 s [User: 55.456 s, System: 166.510 s] Range (min … max): 222.120 s … 239.610 s 10 runs ``` [ Reduce manual_add_modules calls ] Besides making the dracut-install calls faster, group the dracut- install calls. Since the fix in oracular can cause regressions in custom hooks that rely on the current behavior, the SRU takes a safe approach which includes following packages (stating how many dracut- install calls are used): * cryptsetup: 2 -> 1 * lvm2: 8 -> 1 * thin-provisioning-tools: 3 -> 1 * open-iscsi: 9 -> 1 * cloud-initramfs-tools: 5 -> 1 dracut-install calls on a Raspberry Pi Zero 2W: | area | before | noble SRU | oracular | |--------------------------------------|--------|-----------|----------| | auto_add_modules + apply_add_modules | 8 | 5 | 5 | | calls by hooks + apply_add_modules | 42 | 20 | 2 | | hidden_dep_add_modules | 1 | 1 | 1 | | total | 51 | 26 | 8 | [ Other Info ] $ lsb_release -rd No LSB modules are available. Description: Ubuntu 24.04 LTS Release: 24.04 $ apt-cache policy dracut-install dracut-install: Installed: 060+5-1ubuntu3 Candidate: 060+5-1ubuntu3 Version table: *** 060+5-1ubuntu3 500 500 http://ports.ubuntu.com/ubuntu-ports noble/main arm64 Packages 100 /var/lib/dpkg/status To manage notifications about this bug go to: https://bugs.launchpad.net/dracut/+bug/2065180/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
