I just launched 1 instance of xenial and of trusty with the same user-
data, both of these were 'Standard_D1_v2' type. They do not seem to
have such bad performance. trusty does not have systemd-analyze, but
i've included 'dmesg | grep sda1.*mounted' for each, which shows quite a
difference to the point where sda1 is mounted (and then re-mounted rw).
I've also included the initramfs-tools version as xenial and yakkety are
actually running the same kernel version. So something else is at play
here.
# Trusty
uptime: 49.59 seconds
you launched me at: Mon, 22 Aug 2016 18:24:45 +0000
it is now : Mon, 22 Aug 2016 18:27:08 +0000
kernel booted : Mon, 22 Aug 2016 18:26:19 +0000
launch to kernel boot: 94 seconds
launch to user-data : 143 seconds
$ dmesg | grep sda1.*mounted
[ 3.860600] EXT4-fs (sda1): mounted filesystem with ordered data mode. Opts:
(null)
[ 6.797368] EXT4-fs (sda1): re-mounted. Opts: discard
$ uname -r
4.4.0-34-generic
$ dpkg-query --show initramfs-tools
initramfs-tools 0.103ubuntu4.4
# xenial
uptime: 47.52 seconds
you launched me at: Mon, 22 Aug 2016 18:23:50 +0000
it is now : Mon, 22 Aug 2016 18:26:34 +0000
kernel booted : Mon, 22 Aug 2016 18:25:47 +0000
launch to kernel boot: 117 seconds
launch to user-data : 164 seconds
$ systemd-analyze
Startup finished in 7.597s (kernel) + 40.875s (userspace) = 48.472s
$ dmesg | grep sda1.*mounted
[ 5.795233] EXT4-fs (sda1): mounted filesystem with ordered data mode. Opts:
(null)
[ 12.130461] EXT4-fs (sda1): re-mounted. Opts: discard
$ uname -r
4.4.0-34-generic
$ dpkg-query --show initramfs-tools
initramfs-tools 0.122ubuntu8.1
# yakkety
$ dmesg | grep sda1.*mounted[ 305.882955] EXT4-fs (sda1): mounted filesystem
with ordered data mode. Opts: (null)
[ 306.921043] EXT4-fs (sda1): re-mounted. Opts: discard
$ uname -r
4.4.0-34-generic
$ dpkg-query --show initramfs-tools
initramfs-tools 0.125ubuntu2
** Also affects: initramfs-tools (Ubuntu)
Importance: Undecided
Status: New
** Changed in: initramfs-tools (Ubuntu Yakkety)
Status: New => Confirmed
** Changed in: initramfs-tools (Ubuntu Yakkety)
Importance: Undecided => High
** No longer affects: linux (Ubuntu)
** No longer affects: linux (Ubuntu Yakkety)
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https://bugs.launchpad.net/bugs/1615751
Title:
ROOTDELAY= causes unnecessary delay in boot
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