On Dec 7, 2013, at 2:39 PM, Robert Milasan <[email protected]> wrote:
>
> Well that didn't help, but this did:
>
> systemctl mask lvm2-activation.service
> systemctl mask lvm2-activation-early.service
>
> If I only mask lvm2-activation.service, then it doesn't make much
> difference, but masking both it works better.
>
> My question is: why does this happen, if lvm is not in use at all?
Right. And on Fedora 20 I don't have those two lvm2 services, instead I have
lvm2-monitor.service being pulled in even though LVM isn't being used at all.
1.270s lvm2-monitor.service
1.267s systemd-udev-settle.service
[root@f20s ~]# systemctl status lvm2-monitor.service
lvm2-monitor.service - Monitoring of LVM2 mirrors, snapshots etc. using
dmeventd or progress polling
Loaded: loaded (/usr/lib/systemd/system/lvm2-monitor.service; enabled)
Active: active (exited) since Sat 2013-12-07 12:25:57 MST; 2h 23min ago
Docs: man:dmeventd(8)
man:lvcreate(8)
man:lvchange(8)
man:vgchange(8)
Process: 226 ExecStart=/usr/sbin/lvm vgchange --monitor y (code=exited,
status=0/SUCCESS)
Main PID: 226 (code=exited, status=0/SUCCESS)
Dec 07 12:25:56 f20s.localdomain lvm[226]: /dev/sr0: open failed: No medium
found
Dec 07 12:25:57 f20s.localdomain lvm[226]: No volume groups found
Dec 07 12:25:57 f20s.localdomain systemd[1]: Started Monitoring of LVM2
mirrors, snapshots etc. using dmeventd or progress polling.
So is the correct question, why is this service enabled by default? And what
enables such things? Is this an installer just doing the easy thing and setting
it to be enabled just in case the user chose an LVM install (which is the
Fedora 20 default) rather than making it a conditional monitoring? Or is the
correct question why is this one command to monitor taking even 1.2 seconds to
do what it needs to do? That's a long time.
The other thing is that on baremetal I get 30 second boot times according to
blame. However the exact same install parameters in qemu/kvm on that same
baremetal machine and I'm getting 4 second boot times. Why is the baremetal
sooo much slower in user space? I can understand optimization of the kernel and
initrd being loaded but I don't understand the performance of userspace going
from 22 seconds to 3 seconds.
Chris Murphy
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