Public bug reported:
During investigation of low-hanging fruit for improving boot speed, we
noticed that we can shave off a large portion of kernel boot time with:
echo 'MODULES=dep' | sudo tee /etc/initramfs-tools/conf.d/modules-
dep.conf
Before:
$ systemd-analyze
Startup finished in 1.435s (kernel) + 1.601s (userspace) = 2.936s
-rw-r--r-- 1 root root 7.4M Jun 15 09:32
/boot/initrd.img-4.4.0-24-generic
After:
$ systemd-analyze
Startup finished in 762ms (kernel) + 1.706s (userspace) = 2.469s
-rw-r--r-- 1 root root 4.2M Jun 15 09:34 initrd.img-4.4.0-24-generic
We don't want to use MODULES=dep by default on real iron (server, desktop) to
keep portability of root file systems (plugging them into different machines,
changing hardware, etc.). But this is not relevant for virtual environments
like QEMU or Hyper-V, so we can remove all these unused drivers from the initrd
there. This saves time on unpacking the initrd and also avoids some useless hw
probing.
So we propose that the cloud image build system should add this file.
** Affects: cloud-images
Importance: Undecided
Status: New
** Affects: ubuntu
Importance: Wishlist
Status: Triaged
** Tags: bootspeed
** Tags added: bootspeed
** Also affects: ubuntu
Importance: Undecided
Status: New
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1592684
Title:
Add MODULES=dep initramfs configuration
To manage notifications about this bug go to:
https://bugs.launchpad.net/cloud-images/+bug/1592684/+subscriptions
--
ubuntu-bugs mailing list
[email protected]
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
