Public bug reported:
I've instrumented a kernel so I can clearly see when processes start and
exit, this allows me to see when exactly the kernel has handed off
control to userspace. The time the kernel actually takes to initialize
compared to the time systemd-analyze reports are different.
$ systemd-analyze
Startup finished in 16.878s (kernel) + 43.152s (userspace) = 1min 30ms
For example:
[ 2.286330] Freeing unused kernel memory: 1532K (ffffffffb1755000 -
ffffffffb18d4000)
[ 2.296300] Write protecting the kernel read-only data: 12288k
[ 2.304356] Freeing unused kernel memory: 1872K (ffff9d9c6e42c000 -
ffff9d9c6e600000)
[ 2.317659] Freeing unused kernel memory: 1208K (ffff9d9c6e8d2000 -
ffff9d9c6ea00000)
[ 2.344896] x86/mm: Checked W+X mappings: passed, no W+X pages found.
[ 2.368095] exec: 1 (swapper/0) -> /init
[ 2.377284] _do_fork: 1 init
[ 2.381933] exit 53 init
[ 2.386444] _do_fork: 1 init
[ 2.390741] exit 54 init
[ 2.394899] _do_fork: 1 init
and we have the initramfs initialization occurring, and then finally
systemd starts:
[ 16.571630] exec: 1 (run-init) -> /sbin/init
[ 17.287342] systemd[1]: systemd 229 running in system mode. (+PAM +AUDIT
+SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS
+ACL +XZ -LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD -IDN)
[ 17.307892] systemd[1]: Detected virtualization microsoft.
[ 17.314765] systemd[1]: Detected architecture x86-64.
[ 17.421589] systemd[1]: Set hostname to <boottest>.
So it seems that systemd is accounting initramfs time in the kernel time
stats. It would be preferable to be able to report the kernel init
time, the initramfs time and the userspace time rather just kernel +
userspace.
As it stands, the kernel passed off control to systemd at 16.571630
seconds, so I have no no idea why systemd is reporting 16.878 seconds.
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1615685
Title:
systemd-analyze stats for kernel startup time looks suspect
Status in systemd package in Ubuntu:
New
Bug description:
I've instrumented a kernel so I can clearly see when processes start
and exit, this allows me to see when exactly the kernel has handed off
control to userspace. The time the kernel actually takes to
initialize compared to the time systemd-analyze reports are different.
$ systemd-analyze
Startup finished in 16.878s (kernel) + 43.152s (userspace) = 1min 30ms
For example:
[ 2.286330] Freeing unused kernel memory: 1532K (ffffffffb1755000 -
ffffffffb18d4000)
[ 2.296300] Write protecting the kernel read-only data: 12288k
[ 2.304356] Freeing unused kernel memory: 1872K (ffff9d9c6e42c000 -
ffff9d9c6e600000)
[ 2.317659] Freeing unused kernel memory: 1208K (ffff9d9c6e8d2000 -
ffff9d9c6ea00000)
[ 2.344896] x86/mm: Checked W+X mappings: passed, no W+X pages found.
[ 2.368095] exec: 1 (swapper/0) -> /init
[ 2.377284] _do_fork: 1 init
[ 2.381933] exit 53 init
[ 2.386444] _do_fork: 1 init
[ 2.390741] exit 54 init
[ 2.394899] _do_fork: 1 init
and we have the initramfs initialization occurring, and then finally
systemd starts:
[ 16.571630] exec: 1 (run-init) -> /sbin/init
[ 17.287342] systemd[1]: systemd 229 running in system mode. (+PAM +AUDIT
+SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS
+ACL +XZ -LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD -IDN)
[ 17.307892] systemd[1]: Detected virtualization microsoft.
[ 17.314765] systemd[1]: Detected architecture x86-64.
[ 17.421589] systemd[1]: Set hostname to <boottest>.
So it seems that systemd is accounting initramfs time in the kernel
time stats. It would be preferable to be able to report the kernel
init time, the initramfs time and the userspace time rather just
kernel + userspace.
As it stands, the kernel passed off control to systemd at 16.571630
seconds, so I have no no idea why systemd is reporting 16.878 seconds.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1615685/+subscriptions
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